I've been looking for it on-line too with no luck. Anyone got a source? I couldn't see it on Universal mail order.
I'm sorry all, I've been out of town for work a lot lately and no time for fun.
I dug out the receipt and its called;
DM Gru Vehicle BX1253751 $19.95
There was the following phone number on the receipt to order Universal Stuff that may help.
1-888-762-0820
If I had known the scarcity I would have purchased a bunch and hawked them here.
I hope that helps.
Good hunting.