It sucks, but you're going to have to eat the 1k. Just think of it as paying to make sure you go to school somewhere next year. If you were set on SGU before your plans to interview at UMD, then drop that deposit. As stated before, the adcom meets the 3rd Friday of the month, and the last thing you want to do is screw up your chances of holding a seat anywhere.
Good luck, a lot of us have been in this situation.
Yea I think you're right. I didn't know they meet the third friday of the month, and that will definitely cause me to lose my spot at SGU if I wait. 2 years in the Caribbean? Eh. Not how I imagined myself becoming a doc, but I suppose it's the best school for the situation and they put out some really good docs (don't mean to start a debate here haha) then it's worth it. Good luck to everyone!