What websites for trade (or something like that) do you know?

http://www.tf2outpost.com - all items ad exchanges .,.,.,.,.,.,.dotaoutpost.com for Dota 2 items
http://csgolounge.com - CS:GO and Steam ad exchanges + you can bet CS:GO matches
http://bazaar.tf - all items ad exchanges
http://backpack.tf - here, you can check price and add ad exchange .,.,.,.,.,.,.ONLY TF2 ITEMS
https://scrap.tf - you can trade with bot, each item got own price .,.,.,.,.,.,.ONLY TF2 ITEMS
http://csgostash.com - like backpack.tf but for CS:GO items
http://www.steamcardexchange.net - like scrap.tf but here only trading cards are possible to trade
https://dispenser.tf - awesome website with bots which sell all items with fixed price, you can get own bot which sell for you
It's all websites which i use, in comments write websites what you use and describe them.