Cost of Swimming Pool Supplies

How much more does it cost you to maintain your pool this year versus last year?  Or is it too early to tell?
Have you switched from your local store to the web?
Will you do anything differently this year versus last year?  I think many people in the North east will not keep their water temperature as high as they did last year, but that is just a guess.
How many of you buy your pool supplies online versus the local pool supply store?
Do you have your supplies automatically sent on an annual or regular basis?
If you are buying online, where do you see the biggest savings?