Barter's Swap Shop
From the Super Mario Wiki
Barter's Swap Shop is a business operated by Barter of the Brothers Bear in Donkey Kong Country 3: Dixie Kong's Double Trouble! It is located in the northern part of the Northern Kremisphere, west of the base of K3.
As Barter's Swap Shop is not a typical store, Dixie Kong and Kiddy Kong must exchange one of their items to receive one of Barter's. When the Kongs first arrive at Barter's Swap Shop, they discover that Barter has a No. 6 Wrench, which happens to belong to Björn. However, the only item Barter is willing to trade the No. 6 Wrench for is a Mirror. If the Kongs want their mirror back after trading it away, they must purchase it from Barter for ten Bear Coins.