SteamTrade Matcher: QuickMatch [www.steamtradematcher.com]
I only exchange duplicate cards of the same game and if there is not much difference in price.
I check trade offers once a day, so you have to wait.

Only for my friends:
I can help complete a set of Steam cards, but I do not want receive a duplicate card.
Please let me know in the comment to the offer.

Games to trade: Barter(.)vg [barter.vg]