How Do I Participate in A GSA Auction Auction Support July 09, 2018 14:45 Updated Follow To participate you must follow the GSA terms and conditions. Related articles Can the public buy vehicles online? Do I have to have Auction Access to Register? Is there a fee for buying online? What is the fee for purchasing online? I have Auction Access. How can I register online? Comments 0 comments Please sign in to leave a comment.