SCOOT
Literally the most useful trading information site.
It gives you average prices for things you want to buy, plus you can also find cheap offers without spending most of your day on a trading server!

backpack.tf: statistics, prices, and a whole lot more for Team Fortress 2, Counter-Strike: Global Offensive and other Steam games.
Backpack.tf (backpack.tf) has 14 customer reviews on Five Star Index, with an average rating of 3.7 out of 5.
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SCOOT
It gives you average prices for things you want to buy, plus you can also find cheap offers without spending most of your day on a trading server!
Moon
Best and most useful TF2 site! It's the right site to visit if you want to find out the price of your items. There is also many sell and buy orders, so you can always find someone to buy items from or sell items to.
rydz
best tading site for tf2
Meldrop
This site is really useful for TF2 traders. If you're not sure about the price of an item, you can check here. So for the newbies whos skeptical of signing in their steam account, its legit dont worry about a thing
Dk
This is one of the best sites. Made by the owners of tradeit.gg, scrap.tf and marketplace.tf which are extremely trusted. I use this site mainly to check the value of items. There is obviously more things to do than just check the value of items. You can trade items for keys or keys for items and so on.
Cookievoylol
Really good if you want to trade on Tf2, the classified listings allow you to list and look for very specific items and there is a value on almost every item because of a very active price suggestion community.
Mihail
Best Tf2 trading site ever and forever! The only problem with it is that sometimes the prices aren't right which is normal, after all they can't update them 24/7 and it's up to the community which makes it amazing!
Pim S.
works perfectly