May not be too hard to get if you follow KBDMania(the last group buy of KMAC ended in an hour, this could be seen as hard to get but if you pay attention not too bad as the time is usually announced beforehand). In the previous group buy of KMAC, there were two per person limit and total number available was 100, so if you start making friends there, a few people could hook you up.
I just noticed there is significant amount finance restriction between US and Korea though. Wire transferring fee and etc were pretty high and the exchange rate you get from paypal was bad, so the pricing wise, it would be a bit higher than you think, also shipping would add about $50 or so.
Moreover, you should supply your own key caps, stabilizers, and switches.(the DIY set doesn't include them) Also you have to solder the switches yourself or pay around $70(for full assembly and switch mod job). Previous price of KMAC set (PCB + aluminum plate and housing) was 280,000 KRW (in today's forex about 240 USD, should add about 15 USD for fees to have funds transferred considering fee and bad exchange rate) The actual cost to have the board in working condition would be more because you would have to prepare your own caps, stabilizers, and switches.
Hope the info helped.