Or there might be no cars available.
Or even more likely there will be no cheap cars available.
Most rental agencies seem to run out of their standard models during
their peak rental periods, and unless you have a reservation for a
"cheap" car, you won't get a bump up without a corresponding price
increase.
Why not try to reserve through priceline now?
James
Considering there is no advance payment required and you can cancel /
rebook at any time, why not lock in a current price & watch for a better
price?