Why do sites promise "best price guarantee" when they make it so hard to claim the difference between the price you booked for and the price you found later. The T&C's are so complex that I have found twice that I didn't qualify. For $30 or $40, it just isn't worth the hassle. But that's a lot of bad will - so I get vouchers for car hire instead and save $$$$$ over the avis price. They lose because they have to pay a commission and I win. Their problem. If they actually kept their word and made it easy to claim a price differential, I'd only ever go direct.