At this point I use only hairspray and prolly about 2 cans per month maybe. This will probably increase a bit as it gets longer in coming months. That is about 5-6 dollars total a month.
I did end up buying new hair blower, and a straightener but those are one time "start up costs" =p and that crushed me for about 35 or so last month.
Shampoo and conditioner I will only have to buy every other month, maybe even every 3 months. Both combined are about 12-14 dollars.
Unfortunately I will have to spend some on dye coming up as well =(