i bought a bunch of brand-new nintendo made snes snap in connectors from sweden.
I believe hes the only one anywhere thats currently selling them.
I wish i could find some original solder-in ones though in case i get another 1-chip thats had soda spilled in the cart slot.
the 3rd party ones leave a lot to be desired.
ive also bought plenty of console stuff on ebay from Japan. It almost always arrives quickly and in good shape, although many sellers are using a machine translator, so sometimes their messages arent easy to read.
same with buying from china, ive had all good experiences, although sometimes they send the wrong product, and communication isnt always there, but in every case another was quickly sent out.