Ticket Marketplace allows Mets Full-Season account holders with specific premium seating categories to resell their tickets to any Mets regular season home game. Ticket Marketplace also presents an opportunity for any fan to purchase tickets in the premium seat categories.

A few things to remember before getting started:
No membership fee for active Season Ticket, Plan and Group account holders to purchase tickets through Ticket Marketplace. . .

Only Full-Season, premium seat account holders can resell their tickets on Ticket Marketplace.
In order to sell or purchase tickets on Ticket Marketplace, you must register an account.

TFL and ATBS for ticketing professionals

For accounts with Ticket Marketplace Seller’s privileges, upon the sale of posted tickets the seller account will receive ninety percent (90%) of the Tickets Posting Price to be applied toward the Seller’s season ticket renewal for the following season. No action is required in this case. If the Seller Account elects, such 90% portion of the Tickets Posting Price will be paid to the Seller account by check on a once per month basis. To opt in for a once per month check, please CLICK HERE to fill out and submit the required form.

http://newyork.mets.mlb.com/nym/ticketing/ticket_marketplace.jsp?partnerId=2007hp_tixcomponent_nym_tab4&affiliateID=2007hp_tixcomponent_nym_tab4