checking out http://biddingfortravel.com People go on that site and post what they have gotten. Please post back what you got how much. I am going to bid in October.
I just re-read your original post. I didn't know that Priceline offered one way rentals now. That might be part of the reason you aren't getting the rental at a lower cost. Hmmm ..... I have nothing to base what I just said on. I'm just thinking out loud. lol!
Hotwire is a really good indicator as to how low of a price per day that you can bid and be successful through Priceline.
Hotwire has rates in the mid 30's for your dates and needs, so that's probably why $25 was rejected.
Usually Priceline can be successful for a couple of dollars cheaper bid than what you find on Hotwire, but $10-12, is too big of a gap. Just my observations, not based on any scientific facts!