It's a Sales Tax Holiday here in Wisconsin.
It started on Wednesday, and runs through Sunday. Now, there are stipulations, not EVERYTHING is free of sales tax. Here's the list.
-Clothing, each item must be $75 or less
-Computers (for personal use), must be $750 or less
-School computer supplies (for personal use), each item must be $250 or less)
-School supplies, each item must be $75 or less
For more info, you can go to the state's official website about it.