OK, not exactly a group buy, but I read this on a Toyota forum I frequent:
I am giving Toyota peeps a $10 discount on purchases over the next week. Just go to my web site ( www.3n1autocomputer.com ) and pay as normal. Type " Toyota " in the paypal comment box and I will refund you back $10 though Paypal.
If you wanted a second unit for that other car of yours, now's the time! Hurry, sale ends July 30th, 06 .