ONLY deal with known reputable online dealers.
If it sounds too good to be true, it isn't true!
If they have items that are "out of stock" everywhere else, beware!
Use common sense and check (like the OP did here) to be sure the site is legit. BBB.org is a good place to start.
Beware and Good luck!
Caveat emptor!
Oh, and one other thing... make sure to CLEAR YOUR BROWSER completely if you do visit a fraudulent site. No telling WHAT your browser may keep that could compromise your privacy. Ctrl-Shift-Del in Firefox, then choose what you want/need to delete. I set mine to clear Everything - Active logins - Cache and offline website data and do this automatically many times a day, regardless of whether I have been on a suspicious website or not. This is not a sure fire way to be safe, but it helps. I use a cookie extension (Cookie auto-delete) that clears cookies I don't choose to keep when I exit any tab or close the browser. NoScript, uBlock Origin, AdGuard Ad blocker and Privacy Badger extensions.