I pretty much spend $25-50. Once in a while on a special occasion (like a Jessicurl $5 flat rate shipping) I spend a bit more to stock up. Other than that it's the $25-50 range. Last month though I didn't spend anything. I'm sure there are random months in there where I don't spend because I'm stocked up.
2b/3a, primarily use Jessicurl and DevaCurl products, Curls Hair Tea conditioner and various gels. I'm modified CG-ish since 5/04.