You've only won the auction for it 10 hours ago..... wait for the seller to ship it to you first
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
. (That seller is fairly quick in my experience with them).
It says you'll need a power supply in the description. That is the expensive bit!
Maybe find a cheap used POE switch you can use it's 48v 2A PSU. Or brand new PBTech has a MikroTik 48V 2A PSU at $91 but it probably won't have the right power connector.