It could be different every hotel and every time
I have got 3 1/2 star hotels for $31 when they were listed as $100 - $150
Times Iv'e only save a few bucks
If you enter the wrong 3 (4 for AMEX) digit Pin then - If they accept ur bid they will say that there was a problem authenticating ur card, and if they dont accept the bid they will say they cant accept it... Basically its obvious now if they are accepting it or not
I ususally play around with the dates and get a feel for what they are gonna accept - cuz once you make a bid on area with a specific date you either gotta change the date or area, Just changing the bid isnt enough