TradeOnlyStamps is a long-running website that hosts trades between collectors. Drevis Uitterdijk hosts the site, first established in 1998. Any collector can place a free advertisement, listing what they have and what they're looking for. The potential traders can contact each other through the site portal and emails. Traders can also leave feedback on the site after a trade is completed. Periodic newsletters are sent out via email with the most recent advertisements and more!
Though the site hosts collectors from all over the world, I've been trying to economize by participating in trades from the U.S. and Canada only. Not only do many continental collectors have stamps that are as varied as foreign collectors, but the cost of postage is one-half to one-third for each trade!
Having participated in a variety of trading, circuit and exchange schemes over the last few years, I've found that TradeOnlyStamps is one of the most successful in completing successful trades and getting selections of stamps I'm looking for.
JULY 2023 UPDATE : Drevis has decided to no longer host the TradeOnlyStamps website, effective December. He is offering the site to a new host, if one can be found.