It's not really a trade. It would be the two of you putting two players on sale, continuing bidding on each other so you reach the same price for both. It's basically a double sale, looks like a trade because you don't need the final sum on your hands to do it; you just need a small starting amount of money, and bidding on each other will support the ongoing offers.
"BuzzerBeater, the best simulation game of real market economy" (with a cool live basket viewer).