Found the cheapest rate online for a one night stay in a hotel near my condo. About a week later I found the same offer for about $15 less on getaroom.com. I called the number and was able to cancel my previous reservation without penalty and re-book at the lower rate. This might not work the closer to your reservation. They had a clearly stated no refund for cancellations within 72 hours of reservation. Overall a good experience.