You nailed the alternatives on the head: buy cheap plastic or MDF frames that look crappy and are hard to find in the right size, or spend $$$ at the custom frame shop for a beautiful, high-quality frame. I wanted to deliver the same product as the custom frame shop, but in a much more convenient way and at ~half the cost. Could expand into other price point later, but right now trying to hit that sweet spot in the middle where there is a real pain point.