Well that's an over/under door and you just have the "over" part. Unfortunately I'm out of that style, I would have just sent you a spare frame if it was the other kind.

Actually looking at my box-o-junk since I posted this, All I've got left is a nintendo door, some vintage 70's pinball doors and over/under parts. No frames unfortunately. Sorry I couldn't be of any help.
The boneyard is a good source they sell good stuff.
If you want to really get a deal though, just be patient with ebay. My original box of coin doors, which I got 10 years ago, had like 6 doors in it plus parts. I paid like 50 bucks for them and I've STILL got parts left over. The key to getting a good deal is to ignore cosmetic wear.
People will sell you a door cheap because it has some rust or scratches. The thing is, these things are made of thick steel, so as long as there aren't any dents, a quick sanding and little spray paint and most doors look factory fresh. My box had two "good" doors with a bunch of "crap" ones thrown in. Since I re-finished them, I've found that the ones I repainted look even better than the ones that didn't need any work.