VendorBait still works, I've been using it for years. You need to install the unreleased beta version tekkub uploaded back in Warlords. It is the current file here on this site, but you have to go to all files on Curse to see it.
https://www.wowinterface.com/downloa...endorBait.html
https://www.curseforge.com/wow/addons/vendorbait/files