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Walmart has the Schumacher SpeedCharge Battery Maintainer and Charger for $20 + $1 shipping = $21 shipped. Amazon has it for $20 with free shipping on $25+. Automatically switches to trickle charging when battery is fully charged. Compatible with 6 or 12-volt batteries.
$21
$19 shipped at Amazon.
I have these on my motorcycle and mustang and love them. Especially the quick release terminal for the motorcycle.
Good for winterizing the lawnmower battery. Mine used to run down to zero and suffer. I would usually have to replace it the next season.
You don't need anything this fancy for that. Grab a 12V 500mA-1A unregulated wall wart, solder a > 1/4W 120 Ohm resistor in series (10 cents total cost if you have a common as dirt 12V wart and a soldering iron/skills) and Bob's yer uncle. You don't really need to leave it hooked up all winter though, it'll save power if you just wait a couple months, let it run for a week, then repeat right before firing it up for the new mowing season.
Then again, mower batteries are usually ok for the first 3-4 years or so after which it is a uphill battle... typical lawn tractor size can be bought at places like Sam's for only $26 or so w/core trade-in from the old one... pretty cheap when you consider a SLA UPS battery that is less than 1/4th the capacity costs $15-20.