I have a confirmed Paypal account. My wife buys stuff all the time on ebay since Guam SUCKS for buying anything.
My zipcode is 96929, I didnt know your zip or the exact dimensions of the amp, so I used estimates. If you want to run the numbers on USPS.com and make sure all is good, just make sure you choose domestic. The adress should show up as YIGO, GUAM. Parcel Post is the cheapest. I am currently in Afghanistan, so the 12 day shipping estimate is no biggy to me.
Let me know. Oh and I just want one. I am working on a matching one for my components from another seller.