I hope you don't get cardboard but if so, just be careful. If you have any older plastic GCs, just move the funds on the cardboard card to the plastic cards.
I have to buy some more GCs for our trip next month at Sam's which also has the 5% off. The multi-packs in our Sam's are plastic and I got an extra $20 off redeeming points from fetch. It's like a whole year of receipts to save $20 but I guess it's better than nothing. I stopped buying them at my Target and online since I don't like ordering GCs online and buying them in the store was a pain, they never had large denominations.