I'm sure you can find a MUCH cheaper SLA out there somewhere, $40 is just the exorbitant price that Radioshack charges for theirs.
As for the rest of the bits, sounds like you have the makings for a 12v battery charger if you should need one.
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"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.
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