If you're selling stuff on eBay, it can be hard to know how much it's worth. Redditor outfoxthefox notes that you can actually search eBay's completed listings, so you know how much similar items sold ...

Depending on your item, the value can change drastically over time. So, if you’re not sure how much you should charge or how much you should pay for something on eBay, you can view completed listings ...

EBay's Completed Listings feature offers a powerful tool for online businesses. Rather than displaying active auctions, selecting this feature reverses the standard display to show completed sales up ...