Quoted from cfh:

I've used Gary Conway before. I like Bgresto.com much better. For one it's way cheaper. (At least last time i used Gary, his base price was $300 for the glass, and $100 for shipping.) And second Gary's process, in my eye, is less desirable. He basically makes a translite, and sandwiches it between two pieces of non-tempered 1/16" window glass, with silicone around the edges. Steve at least uses the correct thickness glass and it's always tempered. And Steve's process is bonded directly to the glass (opposed to a translit.) To me Steve's process is better. Gary is faster though, as he's been doing it a lot longer, so he probably has more one-off glasses in his files.
As for the one-off stuff. Steve has done a bunch of that for me. but he's my friend, and he uses my games for raw artwork, so he's getting something back when he needs it. But he's not anyone's personal Photoshop monkey, ready to lose money and suck up time for that weird shuffle alley no one else will ever need a glass.