Tried bidding again, no luck. Priceline special offer price now $30/day. Most likely will stick with the Costco reservation which includes second driver.
Intermediate/Mid-Size bid @ $15/day rejected. Might be too early for them to take low bids? Backup res through Costco on Alamo for ~$21/day, which isn't bad compared to the PRICELINE deal offer @ $31/day. Will try bidding again in a few weeks.