Hey dude, as far as I can tell the DVD is pretty easily found (well, at least here in the US). I bought mine for about 10 bucks from half-price books (and it was new, not used).
Maybe you should try Amazon, or some online DVD house. It might be a cheaper way for you.
This is the cheapest I found the Fatal Fury OVA using dvdpricesearch. I've heard that the FF OVA DVD has been discontinued for sometime now..... at least that is what Dvd Aficionado states.