Buy/Sell or trade, there's usually one around for that purpose.
There are times when a gun deal is so good I won't pass up on it, knowing it can be used later for another gun deal. Trade or sell, there will always be guns bought on the cheap and sold for some form of profit.
For instance, I bought an M&P 40 100% factory new in the box at a local Pawn shop for $300 about 6 months ago. I just traded it for a Left Handed Savage Model 111 in 338 Win Mag with ammo, 3 slings, 4-12 X 50 Scope, hard case, even up. That was a great trade for my initial $300 investment.
I'm currently selling another one of my other pistols so I can buy a Ruger 3 Screw Blackhawk convertible in .357/9mm.
I do have a pretty solid collection of guns that will never be sold in my lifetime for numerous reasons, but they're in the safe and staying there for the duration.
Regards,
Gearchecker