I finally figured it out! You have to use the 30% discount coupon first THEN the 50% coupon. Duh! Bit weird, but hey. So then I went to complete my transaction, filled in all the details for the first item, pressed the "purchase" button. I initially set up for paypal, but it seemed to take forever trying to get the paypal info, so I eventually gave up and set up for a credit card transaction instead. After pressing the "purchase" button, I got some fancy messages "Establishing a secure transaction" or whatever. Then .... nothing. The screen went back to the "ready to proceed" state. What happens if I press proceed again? Do I get charged again? I waited a while, about 15 minutes, then exited. Dunno if I've been charged or not. Find out I guess. What a convoluted business!