This thread is useless without a link to said item and a quote of the "wrong" price. You're not doing yourself any favors by not doing that.
There's no free lunch. If you see TM G17s up for sale at $4 instead of $400 then I have bad news for you.
Now if this store did a big ad blitz here and said "Cyber Monday deal, $4 TM pistol with purchase and then reneged you'd be OK being a little butt hurt.
Airsoft, where nothing is hurt but feelings.