a couple of months ago i had one of my watercolors professionally framed - wow, what a rip-off! they charged me around $350 for a frame that is 27x18 inches high, with the picture "floating" on the mat-background. sure, it was burled wood, but still....yikes, that's the last time i did that for sure.
now, when i need odd-sized frames, i order them at one of the framing suppliers on the internet - they have great turnaround times, you can order any size you need, and assembly is just whacking little plastic pieces into the provided corner slots. works great, great selection,and a frame 32x32 cost me about $80 for a wide shadowbox typ real wood frame. glass cutting is not a problem, and i use my logan compact mat-cutter for matting - works great, results are no worse, that what i got from the "professional" place.
other than that, the above suggestions should work fine for you too