Let's play some Game Boy

Reading this post about Metroid II got me all pumped up about playing some Gameboy, for old times' sake.
Here's the two options I've surveyed to go about it:

• Use the My Oldboy! Android app + a bluetooth gamepad and my phone:
  
• Buy an old Gameboy off of eBay:
  
• Use emulators (boring!)

I'm bidding on several Game Boys on eBay, I'll tell you more as it develops :)