Hi - I was trying to purchase 5 DVDs today using the DVD25 code. Everytime I enter the code I get a message that this is not a valid coupon code. I am entering 5 separate DVDs and not just one item. Can anyone tell me what I am doing wrong. I also tried the SAVE15 code for the 15$ discount. It applied the 15% discount to all but one item. #540 Intensity Series.