I had michaels frame a bunch of my arcade posters. they did something called a preservation mount. Some were wrinkled a bit, but they turned out pretty good. they custom framed the star wars and the joust. they made masks for the roadrunner hand drawn and star trek.
I drove to la to have my movie posters framed at www.hollywoodposterframes.com(they did alien and tron, and few odd sized arcade posters I had).
locally, aaron brothers was the only place I could find that sold nice 27x41 in stock frames. I used them to frame up my don bluth dragons lair and space ace posters.