Metal Slug 3 is possibly the most expensive videogame available today, fetching a cool £500 for an import
NeoGeo home system cart. The ROMs on the arcade board are encrypted, which has so far prevented the game being dumped for use with emulators such as
NeoRage. This is a shame, as most arcades over here have long since junked their NeoGeo multi-game cabinets and I have no way, short of working at
CEX, to play the game!
(N.B.: Eventually the encryption was circumvented, so now it's possible to play Metal Slug 3 on your emulator of choice.)