Advice on TCG collectables

(Not sure if this is allowed on here so delete if it isnt)

I recently stumbled arcoss some tcg packs in a local store, didnt realize these even still existed so i bought a couple, they were only like 3 bucks each so i figured why not. To my suprise one of the cards i pulled was "Center of Attention" a card that apparently gives the epic purple shirt item in game & aparently its worth some money.

So my question is, is there any wow collectable specific sub or group in which people usually sell these things? Or do i just put it on ebay and hope for the best? If someone in the community whos more experienced with this stuff could point me in the right direction id appreciate it! Thanks