ご注意(ちゅうい):Attention, Warning
手数料(てすうりょう):Commission, Fee
として:As
店内(てんない):Inside the shop
の:A particle, noun connecter
通常(つうじょう):Normal
買取(かいとり):[noun] Buying
価格(かかく):Price
8割(はちわり):80%
で:A particle, “at”
At the 80% of the normal purchasing price
いただきます:[verb, 謙譲語(けんじょうご) which is one of the Keigo]
Dictionary Form:頂く(いただく)
[meaning] I receive something (foods, presents, etc.) from someone in higher position.
買い取らせていただきます。:[business language] We will buy it.