We're currently booked with Dollar via Auto Europe (found them through Kayak) for an economy car for Dec 24 to Jan 8 for $757 Cdn. That's way cheaper than any other rates we've found so far, including the Costco and Mousesavers codes, and we've got a Dollar confirmation number on the reservation in addition to the Auto Europe one, so it seems legit. Don't know if anyone else wants to give them a try. Kayak was pretty useful in the search, better than any of the other travel wholesaler sites, at least in terms of generating good car rental rates.