I've been trying to do this for at least a few years, but is there a way to put in your costco AWD on avis.com and duplicate the costcotravel.com pricing on Avis's website?

I don't mind doing Costco's site, but I think there are often more car options or can be a bit more specific on Avis's website..... but every time I try this it always is significantly costlier on avis.com than costco.

Can it be done? Do I need a coupon code in addition to the AWD?