A used Air Ex would also only cost about as much as the bluetooth dongle if you were to find the BT adapter (e.g. about $50 vs. $30), and would give you a lot more range (across the house vs. just 6-10m), plus do other fun stuff....
It looks like Belkin used to sell a device like this, but it was discontinued. I'm not sure one exists now. Some printers have their own bluetooth adapters available directly from the printer manufacturer, also.