Just got scammed, anything I can do?

Learn from your mistakes, with the trading system there's no need to go first.

report him at https://steamrep.com/ but maybe u will need some photos, and allways on trades check that site, not his profile, he can delete -rep comments on his steam profile.

If u get scam by somebody, make a ticket at steam support. They will do the work.
I got scam along time ago with some cs go keys and after 1 week after i made the ticket i got the keys back.
If they have + rep on there profile, look at the time, many of them are in groups that give +rep

Sorry for my bad english

Are you sure it wasn't an impersonator?

https://steamrep.com/

Only once I got scammed and I immediately posted key here, in this forum. Ninjas got the key before scammer :D

Step 1 - Gathering Evidence
As soon as you've been scammed you need to gather as much evidence as possible that can prove the scammer is a scammer so you can report them to steamrep to alert other players to be cautious of this person.

Evidence That Needs To Be Gathered Includes:

Screenshots Of The Chat - Should be taken using puush[puush.me], imgur[imgur.com], tinypic[tinypic.com] or imageshack that way the pictures can easily be shared.

Screenshot Of The Trade History - Can be accessed by viewing your item inventory and clicking the "View Inventory History" button at the top right

Scammer's Steam URL - To enable URLs on steam click on steam at the top left on your steam interface, go to settings, Interface and then tick the "Display Steam URL address bar when available". Now go to the scammer's steam profile and copy down the URL at the top.

Any Other Evidence - If the scam occured through PayPal be sure to include an image of the payment being sent/recieved if one was made and block out any personal details if necessary.
Step 2 - Reporting To SteamRep
Now that you've gathered all the evidence your next step is to report the scammer to SteamRep so he can get marked as a scammer. This will mean that players can look up the scammer on this website and see that he is a scammer so they know not to trade with him.

Just click on this text to see what the format should look like, where to post the report and how to make it. [forums.steamrep.com]

You should note that it can take anywhere from a day to a few months for a report to get accepted.
Step 3 - Submitting A Ticket To Steam Support
By submitting a ticket to Steam Support you can get the scammer trade banned or put on trade probation. In some cases items have even been restored back to the victim.

To submit a ticket simply click this text!

In order to file a ticket you must have a Steam Support account, this can easily be created when you're prompted to or by clickig this text.

In the ticket be sure to include as much information as possible including all the evidence from before and a link to the SteamRep report. The more evidence, the more likely they are to help!
Step 4 - Waiting
Now all you have to do is wait. You've successfuly done everything in your power. It can take up to a few days for an email response from Steam Support and anywhere from a day to a few months for your SteamRep report to get accepted.