i've seen most places with nes(usually famicom,but whatever) knockoffs,going by the names of "pokegame","spider game","poly station",the works.
basically they use orange cartridges and have controllers with plugs that are similar to the genesis.

as for the megadrive,there's a shop in tesco at mutiara damansara(near the curve,cineleisure,etc) that sells a sega megadrive(pal,not japanese.good news for me because i lived in england and have pal games).
i tried it and apparently the mega drive they gave me wasn't very good,sonic 3D had really bad music(it's good music,just sounded bad) and the controller they supplied was really iffy.
times like those that make me wish i had the arcade controller back.but alas,i have made my move to the xbox 360

OMFG
those pictures make me want to cry...

but what would make my heart burst is if anyone has the philips cd-i.
i'd really like one.though i've never heard of it,let alone play it,it feels really nostalgic looking at the videos of games i've never heard of.