These are coming much more often recently. You can get 5x the usual the rate in eBay Bucks, which is 10% back, on purchases of $50 ore more. The Promotion starts at 8:00AM PT on September 28, 2015, and ends at 11:59PM PT on September 29, 2015. Extra eBay Bucks can only be earned on every single item purchased that meets the minimum purchase requirement specified in the offer. Valid on multiple qualifying purchases made within the promotion time period. In order to qualify for the offer, you must click the email to activate.
Only invited, registered eBay Bucks participants who receive the promotional offer from eBay in My Messages are eligible. These offers are targeted and you need to receive the email in order to qualify or you can also check your eBay account.
Keep in mind that you don’t earn eBay Bucks when buying eBay gift cards, so the offer should be used to purchase other merchant’s gift cards that can be sold for a profit.
Right now the best offer by far is from InboxDollars at 5% cash back or the second best BeFrugal that will give you 1.1%. The problem with InboxDollars is that it’s a relarively uknown cash back portal. Also you’ll earn points/miles if you use your favorite credit card, or just use the eBay gift cards you’ve already purchased.
There’s lots of gift cards still on sale on eBay and you can find the full list here from a previous post.