Upstate stores are busy today with shoppers who've waited for the most opportune moment to buy back-to-school supplies and other merchandise that's tax-exempt this weekend.

But News Channel 7 wanted to put stores to the test.

Would we be charged taxes on items that were supposed to be tax-free?

We went into a BI-LO, Publix, Wal-Mart, Target, and Big Lots in Greenville to find out.

Almost everywhere we went the scanners had been changed and we weren't charged any tax.

But at the Publix at Thornblade it was a different story.

We bought pantyhose and adult?diapers---both of which are on the tax-exempt list for some reason---and had a tax on our bill.

After we brought it to the manager's attention, employees e-mailed company headquarters which downloaded the correct scanner information.

He says it should be correct now.

But it just goes to show you that even during the tax holiday you have to keep an eye on your receipt.