One of the game stores near me sells Contra, cart only for $20-25.
Why? I'll never know.
But i can't fault them for everything because I've gotten some sweet deals on good stuff (Saturn 4+1 cart for $15!).
That same store sells Mega Man 2 for $20, but i got a cart only copy with ripped label (like i care) on Ebay for $5 shipped. $5! Plays the same, and I saved some $$.