The economics of framing are tricky too. Frames are actually just as cheap in China FOB price, especially if they are a mass-produced size. Even if not mass-produced, a frame from China would be priced in line with a custom painting.

The issue is that shipping prices are by weight, and the frames are usually much more heavy than a piece of canvas. This significantly drives up the total price of a frame from China, and lets American framing companies charge much higher prices.

Pro tip: get the artwork in a size that already fits a standard frame size and you'll save a ton of money.