You can buy $100 Staples Gift Cards for just $85 on eBay through PayPal Digital Giftcards. The gift card will be sent out with email delivery to the email address associated with your PayPal account.
There’s a limit of 5 per buyer and about 15,000 gift cards available.
You will earn 2% eBay Bucks and you will get 5% if you pay with your Ink card through PayPal.
Also go through shopping portals such as Splender for 2% more in cash back.
You can make a few bucks by reselling them on SaveYa which is offering 85.5%.