Here’s a top ten list of Original Comic Art sold on eBay USA in May 2019. The list is based on higher ending price, and there are 2 lists: one for auctioned pieces and one for buy it now/best offer.
If you want to know about pieces like these when they go for sale, subscribe to the (free) Original Comic Art Tips newsletter by going to the home page. Each week I look at all the original comic art auctions (eBay, Heritage, ComicLink and other auction houses) and highlight the best items (no scrolling through fanart, fake production pieces, etc.).