Well I work at sears and this deal popped up that will be going on from March 3rd-9th only
The battery maintainer is part # 028-71219.
It is regular priced $29.99
but if your a Shop-Your-Way-Rewards(free points card) member you get them 50% off.
So the Maintainer will be $14.99
If your not a member they can sign you up at the register. It is quick and easy.
You must give them coupon code: 9800680456082468
They are pretty nice too. They are fully automatic, come with a few attachments, and have a 3 year warranty.
Link for description: