Is it at all possible to get replacement keys for a regular mac keyboard rather than shelling out for a new keyboard (I have the newer black/clear usb one)? I dropped mine and the 1 and 2 keys broke. The underlaying keyboard is fine... it's just the button covers that I'm missing. I moved over the 1 and 2 keys from the numeric keypad for now but I'd like to get the actual keys and have a full set again.