I don't remember exactly (have to check sources
, but I think the AC Pro was Y17800 and the AC Duo was Y12800.
The yen rate was roughly Y105 = $1 (03/94) so that would put them at ~$170 for the Pro and ~$122 for the Duo. I bought the AC Pro and Fatal Fury 2 on release (in Japan) and I remember shelling out over $200 just for that. I had been saving for months just for that reason.
Random Trivia:
Most people may not remember, but the AC release was delayed 3 months (minimum). It was planned to be released in Dec 93, but after the large fire at a RAM production facility in Taiwan, RAM production sank drastically while RAM prices skyrocketed. Hudson released a statement saying that the chips that were to be used in the Arcade cards were in shortage and they couldn't get enough. Therefore, they delayed the release to March 94.
I believe Flash Hiders' release in Dec 93 was supposed to coincide with the AC's original projected release date since it utilized the AC's extra memory (and the first game to do so).