I picked up 4 tubes of 48" fluorescent tube and double checked with salesman to ensure it was on sales. I made the payment and assumed that it will charge me correctly. I found out that they charged me in regular price when I looked at the bill at home. It just wasted my time to go back for a refund and I am not sure it was caused by a human mistake or just the computer. I learned a lesson and don't trust what they asked you to pay, and always check before you leave.