@Dhau
Well, the idea is nice though off, but Chinese companies are really not interested in making a couple of thousand bucks 
Besides that, development costs of the parts would make everythng a bit too expensive to win everything back with only a few 100 pieces.
If you can find a few 1000 people that are interested, let me know 
I might know some companies in China interested to do the job
Well, you can sell 1000 probably, if you come up with some good cover-up story a-la Tengen Tetris. Like two full truckloads of MG2 was burried in a landfill back in 1991 due to very low demand... Many years later two brave japanese users unearthed the games and now anyone willing to pay can get a copy from eBay
A no frills way: send any SCC cartridge and 60 euro to Manuel Pazos for MegaFlashSCC and ask for a bonus MG2 sticker. On arrival flash japanese MG2 rom and sell it on ebay with start price 120 euro. I think you'll make a moderate profit
Me was once given a Metal Gear 2: Solid Snake cartridge... I still have it but it don't work 
I have the cartridge only.
Sell it on eBay, with "Condition unknown" clause
I can bet most collectors don't even have MSX system to run it, so it doesn't matter if it doesn't work
Me was once given a Metal Gear 2: Solid Snake cartridge... I still have it but it don't work I have the cartridge only.Are you talking about the very first Metal Gear 2 prototype and demo that was shown by Hideo personally on the Tokyo International Computer fair in 1988? Wow! That thing will fetch a lot of PSX-money on ebay! 
You're not suggesting to sell them as being real ones, are you?Uhm, that would be the whole point indeed... Note that I'm not suggesting anything! But the thought does come to mind when you see another moron pay $500,- for a MG2...