Hmm...

I can't help you with what may/may not be available to ya, but I can give you a little help.

Winchester, Remington, Browning, Ithaca and Benelli are good brands, and even their older models are pretty high quality.

www.gunbroker.com offers a TON of guns (new and used) and will ship to any licensed firearms dealer (in the U.S., we call them F.F.L.'s) (federal firearms license or something).

Go there, and look for 12 gauge shotguns, and get an idea as to what you can afford. Then, hit up your local gunshop and see if they can get one for you.

I'm unsure about what arrangements must be made to ship a U.S.-registered firearm over international waters. I'm pretty sure that it would behoove you to find something at a local shop. Use Gunbroker as a research tool for price and what you want.