ugg, one of my AWDs shows the price until the last checkout, at which point at the last reserve confirmation button it error:

"The Avis Worldwide Discount (AWD) number is invalid."

UPDATE: I had it pickup neighborhood location and drop off to nearby airport, no extra charge, it was erroring. I went to try it with roundtrip same location and worked. I then went back and did the original and it worked. Maybe a glitch, or maybe sometimes you have to reset it like this - leaving this post up in case others have similar problems.

I've noticed some strange things in the past when testing AWDs sometimes the process gets messed up.