This is YMMV ~ I do not know if eBay offers this to everyone or a subset of their registered users. Good until Friday 3am eastern (6/1/17), you earn 8% on items purchased during this promotional period. No minimum purchase amount for this offer, so even a $2 widget will get you 8% eBay Bucks! Some exclusions apply as usual and the maximum rewards you can earn is $100 per transaction, and $500 during the promotional period. You must manually activate the offer by clicking on the appropriate button in the email or eBay message.
A good place to look for ideas are the eBay Deals along with the Trending Deals (shows only 100 trending deals, less overwhelming to look at than their main deals page). There’s also a dedicated search box there that searches only the Deals, not everything else on eBay.
Another way to look for ideas is our eBay Archive posts.