Which resort are you looking at? In Borovets, you are looking at about 70euro for the week for board & boot hire - but bear in mind, the difference in price from school to school is mainly based on quality of gear as it varies greatly...!
If you are looking at prices in Bansko, the best people to help will be Nightmuffy / Steve C - they should be on the forum at some point later.
There are numerous schools which have good equipment - but they tend to be the smaller independent ones. I will send you the info we have on this years prices from 3 of the smaller ones.