Travelocity best - most sizes $370 total Dollar
Hotwire best - most sizes $364 total ($36/day+taxes/fees) unknown agency
Kayak best - used Priceline opaque - SUV (compact was only $2 less) - $327 total unknown agency
Kayak used Priceline opaque pricing at PL's counteroffer level, which was 10% less than retail and Hotwire
Priceline direct stayed close to that counteroffer level (finally accepted my bid at only $2 less).
Fall is a busy time of year there. So I'm not surprised pricing was not that flexible.
Thank you, Sheryl!