As long as the total cost of the non-giftcard items in your purchase is equal to or higher than the points you redeem you will be fine. So if you buy $50 worth of products and also $50 worth of Disney cards (total = $100) you can redeem $50 worth of points.I ended up getting them at Zehrs - they only had $50 ones. Shoppers had up to $500, but their system was down. One thing I noticed when I was doing the self-checkout - it looked like I could have used my Optimum points to help pay for the GC's. I thought this was a no-no? I didn't use them, but maybe good to know though for in the future.