Those things are mostly gallery wraps using the cheesiest imaginable materials. I have seen examples of canvas wrapped around big chunks of insulation type foam, and "stretcher bar frames" that were essentially corrugated cardboard boxes. They're bringing it in by the boatload, and there are even some large operations here in the US making the same schlock. Target, Wal-Mart, Kmart, and various other fine retailers are starting to carry them at stunningly low prices, and of course ebay overfloweth. You can even order them direct from China with the copyright-violating images of your choice, just send them the URL.
Has influenced me to completely drop gallery wrapping in favor of framed canvas. I think it's important to distance myself from that newly de classe look. "Oh yeah, we saw some things just like yours down at Wal-Mart! But they didn't cost this much."