Hi. There isn't a lot of buying and selling on this site yet. You may want to try this facebook group which is pretty active. Otherwise, Craigs List is pretty popular for Peloton buying.
Peloton Buy Sell Trade (BST) has 173,105 members. Unofficial Buy Sell Trade of Peloton Bikes, Tread, and Boutique Closed Facebook Group Moderators for this BST page can be reached in the top banner...