I've been buying traditional lead acid batteries for my ATV's because I didn't want to pay a lot more for true, maintenance free, sealed batteries. Despite using a trickle charger on them, they never seem to last more than a year.
It seems battery technology has reached the point where you can get much greater value than in years past. However, don't expect to find these deals on store shelves.
I got this battery for less than $50 bucks shipped to my doorstep in three days. Sealed battery for a great price