I don't use PL very often & have never used a bonus cash offer, but here's what I found online - this offer expires on 9/30 & must be redeemed within 24 hours of getting the bonus cash!

1) Go to http://travela.priceline.com/promo/cash/1348619 - if that doesn't work, go to http://www.couponcabin.com/coupons/priceline/ and click on the "Exclusive" offer.

2) Enter email address (create a PL account if you don't already have one - I wasn't sure what was going to happen, so I used a junkmail account vs. my regular PL account - it prompted me to create an account)

3) then it says: Your $20 hotel Bonus Cash has been deposited into the "my rewards" tab of your priceline profile.

When I go to redeem, it says:
rules and restrictions
1.Valid on 3-star or better hotels
2.Valid for Name Your Own Price hotels
3.Valid on stays of 3 or more nights
4.Hotel stay must be completed by 11/30/2010.
5.This offer expires on September 23, 2010

Note - the Bonus cash is only valid for 24 hrs from the time you sign in - so make sure you know what you want to buy first!

how bonus cash works
1.Starting on this page, tell us where and when you'd like to stay.
2.On the next page, you'll select the neighborhoods and star levels you want and then you'll Name Your Own Price®.
3.We'll automatically add this Bonus Cash to your offer price, increasing the chance that you'll get a great deal.