If it’s too good of a deal, then it’s too good of a deal. Sooner or later they’re going to be taking peoples money buy offering $25 off retail. Or hell even mark shit up.
There are rules for WTB or similar. I feel bad for you bro but you need to make sure you’re covered before sending money online. One way to counter scammers is always pay with G&S or mention that you only pay with G&S.