My BF's sister used this place several times to custom frame photos she took and then enlarged. We're talking BIG frames! The smallest measures about two-and-a-half by three feet and that's being modest. They helped her pick out a matching matte for the photo, the frame itself, and then mounted it, ready to hang.
I think the largest one she has measures about five feet across and cost around $200. I should mention that it was several years ago, so prices could be different now. Oh, and it's glass, not plexi.
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