I used the Ent. Book code 5066914 as the product rate code, the coupon 10009120 as the coupon ID and the priceless 6600330 as the contract ID and it worked. I've tried different codes in different places and if it isn't right, it comes back and tells me the ID code is incorrect or coupon code is incorrect, etc but it took all three of these numbers in the fields I mentioned above. If you switch them around (use 6600330 as product rate code and 5066914 as contract ID) or use a different code then the Priceless, it doesn't deduct the State Tax so it would be about $7 more.
The Ent. Book code is for a 3 or 4 day rental with a week-end in between and the hours you pick it up and drop it off have to be exactly the same. We're really not leaving until 3:45 but we're getting there at 11:30 so I tried 12:00 as my pickup time and 2:00 as my drop off time and it wouldn't let me do it. I then changed the 2:00 to 1:00 and it still wouldn't let me do it.
The coupon states: "One free weekend day. > Valid for the rental of a midsize through fullsize four door car. > 3-Day minimum (4-Day maximum) allowable keep. > Offer valid through 12/31/05. > Friday and Saturday overnight required."
I just tried the codes again and got the same rate. I'm a member of the Emerald Club and signed in so I could use Emerald Reserve but I don't think that makes any difference.
If it doesn't work, I'm not sure why. Like I said, I just tried them again and got the same rate. Hope this helps.