On what shall I spend my penny?

Email from Amazon this morning:

Greetings from Amazon.co.uk.
You saved £0.01 with Amazon.co.uk's Pre-order Price Guarantee!

The price of the item(s) decreased after you ordered them, and we gave you our lowest price.
The following title(s) decreased in price:
The Second Best Exotic Marigold Hotel [DVD]
                     Price on order date: £10.00
                     Price charged at dispatch: £9.99
 Lowest price up to and including release date: £9.99
                      Quantity: 1
                      Total Savings: £0.01

£0.01 is your total savings under our Pre-order Price Guarantee

How ever can I thank them enough?