Since you're in a hurry, I would say keep it simple. Make it 11.5". I'd look for an H-web, but people have their own preferences about that. Anything with laces in the web can catch your fingers. Go A2000, A2K, HoH, or Pro Preferred. A2000 and HoH will break in quicker than the other two.
Don't buy anything without him trying it on. Search eBay for "11.5 baseball glove" and limit the distance to a reasonable drive, then contact the seller about trying on the glove before purchase. Might get lucky with craigslist, but not likely to find an unused glove there. Dick's may also have a decent selection, but you probably will pay full retail there. He might also have a teammate who's looking to sell one. Good luck.