I believe your problem here has nothing to do with Priceline.
Whenever you rent a car (and even when the car is pre-paid like with Priceline), the car rental company requires a Credit Card to be given when you pick-up the car so that they can process a credit "hold" against it. I believe they all do this to make sure there is some amount available to them if you should keep the car longer, return it with minor damage, etc, etc.
And with most rental companies, whoever is the driver/rental contract name...that person must present a Credit Card in their name. Priceline or not. Standard policy at most rental companies.
If your husband has no Credit Card but the the rental is in his name, you basically have to change the rental over to your name. And if he wants to drive on your rental, you then have to pay the "Additional Driver" fee.
Pain in the butt, I know. But that's the way car rentals usually work, and this doesn't sound like a Priceline problem.
And FYI for future reference, this FlyerTalk forum is about Miles & Points. If you go to the "FT Travel" logo up top there and click on it, you'll find a "Online Booking and Bidding" forum for this type of question.
[This message has been edited by PremEx (edited 10-12-2003).]