Most of the items I have bought on eBay recently offer no questions asked returns, even shipping is paid.
Ask to return an item and they will email you a label which you print out. Box the item up and attach the label, in a few days you are notified of the money being returned to your account.
Lately I have had faster delivery from eBay than Amazon Prime.
We have never refused to take back an item we have sold on eBay. When we put an ad up; we already have the item in a box waiting for a shipping label, and if someone buys something before the post office closes... it gets taken down that day.