Agoda.com is one of the biggest hotel booking websites in the world and claims to offer ther lowest prices online. This isnt always the case but its certainly worth checking out.

They currently have 111 hotels listed for Pattaya and many more for Bangkok.

In addition to low prices they also have a Reward Scheme which works as follows

"Book any room on an Agoda site (like Agoda.com or Planetholiday.com) and you automatically earn points worth 5% - 7% of the price of the room. Use these points anytime on any of our 33,000 hotels worldwide, no restrictions, to reduce the price of the room by the amount the points are worth. Or you can let the points mount up after several bookings and use them to get even bigger savings, or even free rooms! You decide".

Looks good

Check out Agoda at http://www.agoda.com/asia/thailand/pattaya.html