Maybe it's too early to say definitively, but I think I love washing my hair with baking soda and vinegar. My hair seems clean and doesn't smell or feel weird—in fact I think it might actually be less frizzy now, which is nothing short of miraculous. Best of all, it's one of those rare switches to a healthier and/or more environmentally friendly product that doesn't end up costing twice as much. In fact, we own (for some reason I can't recall) a 12-pound bag of baking soda, and that puppy just graduated from "dead weight in the lazy Susan" to "infinite supply of shampoo." I will literally never need to buy it again.
(If you're curious about how to do this, here are the instructions.)
Now that I'm going to be saving SO much money on hair products, I should have plenty left in the New Life Plan budget to purchase a 10-pound bag of chia seeds. What? They have many uses, apparently. I am most interested in trying them as an egg substitute, because there are many, many Paleo baked goods I would love to try making for my egg-allergic son. That and blackberry jam. And crackers. And sprouts.