I was able to find Biokleen at Costco in a huge container for a decent price.  It's lasted my husband and I almost a year, and cleans very well.  You have to have a membership, but I've found that Costco is carring an increasing number of environmentally friendly products.

I have found many of my favorite organic shampoo and laundry soaps at costco in very large bulk containers. (We don't have a large co-op where I live).  You may want to check your own local store.  

The Costcos in my area (Chicagoland) are carrying Clorox's new Green Works in large bottles as well as many large containers of organic and eco friendly products.  I like their organic instant oatmeal in a massive box.
Trader Joe's also sells a laundry detergent in large quantities if you are luck enough to have one near you.

Also - buying from a "regular" store - Costco, Sam's Club/Wal*Mart (shudder) and the like, tells them back at corporate that there's a market for this stuff and makes they stock more eco/green/hip products.  It's like buying the organic produce from the regular store (only when you can't get it locally, of course).  And don't hesitate to ask management if they have it, or can get it (probably can).  And if we all keep asking and buying and making noise, the organic, green, sustainable product selection will grow.

I get all my bulk eco-products from Azure Standard (azurestandard.com).  They are a co-op type of organization.  If you live in the northwestern U.S., deliveries (including perishables and frozen foods) are made through their own refrigerated delivery fleet.  There is a required minimum order amount of $400, but they have a system where you can either join an existing drop point near you or start one of your own so you can aggregate orders with friends and neighbors to meet the $400 minimum.  There is no delivery charge and, in my case, no sales tax.   Deliveries are scheduled every 2 or 4 weeks, depending on your area.

If you don't live within their delivery area, you can't order perishables and frozen foods, but you can get staples delivered via UPS. The $400 minimum doesn't apply in this case, but you pay for shipping.

They have a good selection of, well, everything,  from organic frozen meats to 5 gallon buckets of laundry detergent to plant starters to organic cotton underwear to mouthwash.  Order a single, case or bulk package of many staple items.  Their wide selection and good prices make up for the inconvenience of either ordering $400 at a time or dealing with drop points.  We don't have a problem meeting the $400 minimum because we basically do our grocery shopping through Azure and order frozen meats, canned goods, cleaning products, personal hygiene products, etc.  But then we order once every 2-3 months and we have two freezers.  Word to the wise, though, their fresh produce can be hit or miss.  And the eggs aren't super-fresh.  We get fresh produce and eggs once a week through our local co-op (Fresh Abundance) and/or our local grocery store.

Our local Fred Meyer supermarket also has a nice nutrition center (i.e. where you find the organic products and bulk food bins) and anything the nutrition center normally stocks, as well as a few things that are in their catalog but are not normally stocked, can be ordered by the case (which unfortunately doesn't address the packaging issue).  Nutrition center special orders receive a 10% discount, whereas normal grocery special orders do not.  So it doesn't hurt to ask your local grocer if you can order by the case or bulk package and if you will receive a discount.  I haven't tried, but I imagine that any of the bulk bin items would also be available for order (like oatmeal or flour).

For shampoo and conditioner, we get one gallon jugs from Kettle Care.  Very, VERY eco-friendly products with a wonderful smell.

I don't want to rain on the bulk parade since I also strive to minimize packaging waste, but I do want to point out that one of the components of your carbon footprint is the size of your house (or extra storage space).  If you end up increasing your storage area, you may be inadvertently increasing your carbon footprint.  If you can stow it in an underutilized space, you may not have a problem, but you may want to factor in your carbon costs if you are creating additional finished areas with racks and lights and things.  As we all know, it's about balance.

Have you checked into Frontier Co-op stuff?  www.frontier.coop  You can access their retail catalog online, and buy things in bulk.  Also, you might inquire if there is a buying club for Frontier in your area (there is in mine).  For buying clubs, you get to buy at the wholesale rate, and if your club order is over $250, you get free shipping.  If there's not a club in your area, maybe you have enough interested friends & acquaintances that you could put one together?  Frontier has lots and lots of mainline stuff, including natural home & garden products, health & beauty stuff, herbals, spices, and so on, and a lot of well-known name brands (7th Generation and Aura Cacia come to mind).  Frontier is frequently the supplier for the spice section of co-ops, too.  I really dig my Frontier buying club here.  Good luck!

Although not "in bulk", I use Shaklee products, which are concentrated so that packaging is significantly reduced.  A gallon sized container of laundry liquid lasts my family of 2 more than six months.  To cut down on shipping costs and their environmental impact, I order "doubles" when I order.

Susi

Here on the West Coast, Oregon Soap Company has looong blocks of soap that can be cut off into any size chunks--<www.oregonsoapcompany.com>, 800-549-0299 (I don't believe they print a catalog).
Sarah