http://www.swap.com
2. BarterQuest
http://www.barterquest.com
3. Caveman Trading
http://www.CaveManTrading.com
4. Favorpals
http://www.favorpals.com
5. Swap Treasures
http://www.swaptreasures.com
6. SwapDen
http://www.swapden.com
7. OurSwaps
http://www.ourswaps.com
8. TradeAway
http://www.tradeaway.com
9. U-Exchange
http://www.u-exchange.com/
10. U-Barter Exchange
http://www.ubarterexchange.com