If you're in or feasibly near Tennessee this weekend, there's tax-free shopping on clothes, computers, and school supplies. A lot of places will have sales to coincide with it (even more savings!), because it's a busy weekend.
Here is a list of sales tax holidays in other states. Most of them are nearer to the fall for back-to-school purposes, but we get two for some reason. I guess it's our 9.25% tax...
I hope this isn't too local; it doesn't seem to be against the rules, but I'll take it down if it is.