Its definitely a buyers market... I bought my '08 Supra Sunsport 22V, fully loaded (340 hp, Z5 cargo, CNC prop, Gravity III, pull out heaters, upgraded stereo, rad-a-cage, 4 wheel disc brake trailer, LED's, Wakeboard Pro PPass, etc etc...) for $40k. MSRP on this boat was $64,000 with all the upgrades.
I shopped for used boats at first, but as Jason mentioned people are so upside down in there boats they cant sell them for there pay-off. If you own it outright you can price it to sell, otherwise you might have to take a loss on some of it. Or make the payments and hang on to it until you come back to the states.
Good luck, try posting it on craigslist, its free and gets a lot of hits every day.
P.S. Thanks for your service, its appreciated by all of us....