BASIN makes wonderful soap and shampoo bars. I love Egg Noggin and Hair Nut. However, when a small bar that lasts approximately a month costs $7, it's hard to justify buying the bar on a regular basis. There are a few other companies making shampoo bars as well. Basin seems to make them because they're luxurious. The other companies mostly seem to be making them for their eco-friendly advantages.
I'm inclined to start buying my shampoo bars from Burt's Bees because although their bars aren't much cheaper than Basin's, at least I know I can find them locally. Basin is available on line and at three stores in California, Florida, and Minnesota. Burt's Bees, well, practically every big box retailer has a shelf of their products somewhere. Anyway, BB has two bars I would like to try, Baby Bee Shampoo Bar, and the Rosemary Mint Shampoo Bar. The Baby Bee bar is listed as out of stock on the website but the Rosemary Mint bar is listed at $6 even. The Basin bars are 65 grams, the BB bar is 98 grams. Of these two, I say go for the Burt's Bees product.
Next, J.R. Liggett. I had some trouble getting into their website and almost decided to not include them in my quick and dirty survey of the available options. I looked at their Original bar as a representative of the four formulations they carry; it is 99 grams for $6.49. Ba'al has used their shaving cream in the past and really liked it. They are a very old company still using the original company recipes so they do have staying power. I know some of their products are available at Bath and Body Works (where we've gotten the shaving creams for Ba'al) but I don't know how widely their other products are carried.
Last today, Vermont Soap. I like their choices. They have boxed bars for $4.29 for 99 grams. But you can get their Eco Brick, a brick of soap you cut into bars yourself for $36 dollars. This works out to $3/bar if you slice the brick into 12 bars. It appears they only have two choices, though, an unscented bar and an aloe and lavender bar.
Of the three bars that weigh the same, I'll probably go with Burt's Bees. It's not the cheapest but it is the most widely available without having to order on line. In my mind, ordering on line negates some of the benefit of choosing a bar shampoo in the first place because of all the additional shipping packaging.
However, there are non soap options also. The Hair Boutique has a very nice page about using dry ingredients found in any kitchen to clean hair without water or liquids. Cornstarch absorbs grease but can be drying. Other flours are less drying but can color light colored hair. Eggs can be used, either by whipping whites to stiff peaks or by creating a masque with egg yolks. The one that's most intriguing to me is making a scented cornstarch with rose petals or other flower petals. Since I have a jar of rose petals in the back of a cupboard, I'm thinking about trying this one out. Just need another box of cornstarch and a pretty jar to put it in.