Not really. My three most recent rental experiences (or attempts) were:
--one-day mid-size rental in PWM for $29, all in, last week, midweek
--an attempted three-day rental from SNA that I couldn't get a price lower than $330 on from any company, so I bagged the whole idea of renting a car, three weeks ago, midweek
--a 12-day mid-size rental booked for ANC for $627, all in, starting next week
The first and the third were booked with the "magic" code on National. I tried that in SNA, but didn't have any luck. So I am batting .666 on good pricing.