It's been 8-10 years, but I recall that with currency exchange and all, the kit was 1/2 - 2/3 of domestic price. Now of course the shipping was free, since I stuffed it in my suitcase and flew home on the ticket my employer purchased.
Korea was a bit more straight forward. The Academy boxes have a number on the side, just below the kit number, it's basically the Korean version of MSRP, in Won. For instance 8500 would be 8,500 Won, (at about 900 Won to the U$1.00), around U$8.50. Same kit in my local Hobby Town U$20.00.