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Ends today. Advance Auto Parts has the Schumacher SpeedCharge Battery Maintainer and Charger (SEM-1562a) for $27 + $3 filler (7-pack Shop Towels) - $10 off with coupon code A124 - $8 rebate [Exp 11/28] = $12 with free in-store pickup or $10 shipping to home; free shipping with $75+ purchase. Automatically switches to trickle charging when battery is fully charged. Compatible with 6 or 12-volt batteries. 
$12
Previously discussed here:
http://bensbargains.net/forum/viewtopic.php?t=303620&highlight=
Most of the comments in that discussion are off-base. To begin with, 1½ Amps is a trickle charge for a car-sized SLA battery. If you read the product page, what it does is switch from that to a float charge when the SLA is charged up. Float voltage for a nominal-12V SLA is 13.8V, and the battery can be left in that condition indefinitely without harm.