Clothing under $100, school supplies under $100, and computers under $1500. Thats per piece, not a total. There are of course exceptions, and anybody interested should make sure they are aware of them before shopping. This weekend is primarily to help ease the burden of back to school shopping for parents. Kids going off to college, new kids in school, or even returning students.
I am not aware of any store that does not honor this, except maybe those who do not sale anything that meets the requirements. Most places even have decent sales on top of the tax free, so get out and boost the economy.