People keep saying you can get an arcade card for $20. I have an original TG-16 CD with a super system card, so if I get an Arcade Card I'd need the Pro. Where can a Pro be bought for $20?
Assuming you have everything needed to run the card in the US system:
You won't unless you get a great deal. Arcade Card duo - loose is 20 and 30 complete - > pro is around 55-60 loose. Both + shipping - which may have to come form Japan.
Arromdee - Yeah, any quotes for $20 Arcade cards you've seen are probably referring to the Duo, not the Pro.
That said, Swimbz estimates on a loose Pro are rather high: Hit Japan has a CIB Pro for $60 and they usually accept offers for 20% less. Also remember that this is a month-old BIN; wait a few months for the right auction and you can do better, especially loose.
Japangamestock used to have 'em loose for $20, but that was years ago. Still... they might be worth checking once in a while.