Oh, silly Dave. Doncha' know it's EASY for us to support something so awesome? :)
For an independent cartoonist like myself, there is no kinder support you can show than picking up a book in the Sheldon Store. It directly relates to the continued good health of the strip and the site.
...And with the kind support you guys continue to show the strip...there'll be new Sheldon comics for many years to come. :)