Can buy Retron 2 at Fred Meyer for $44 but Contra itself will cost about $50. Add to that the fact that  Sadly, the NES slot does not have the eject button, and while it doesn’t have the problem of not fitting in the slot properly, NES games are a complete pain to get out of the system. I have seen at least 4 systems where the nes game slot was damaged due to games getting stuck in the system. Our store dispay model no longer plays NES games due to several of the metal pins in the game slot being bent or ripped out. (source)

Preowned NES controller sells for about $11 at gamestop . Add to it $12 for NES to USB adapter

I originally bought a NES USB controller and that thing was horrible. I couldn’t believe how horrible it was. It was so bad it made me go digging through all of my storage to find my original NES controller that I wasn’t entirely too sure I even still had. (source)

at amazon:

adapter: