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Flooded lead acid batteries are going to be the cheapest.
Sealed, gelled, or AGM batteries are also good choices, but typically more expensive.
It is possible to get used batteries. They will NOT be as good as new ones, but may be good enough, and will cost MUCH less.
Check around at golf courses, salvage yards, battery wholesalers, anywhere you can think of that may have used or discounted batteries available. It can be a lot of work, but you will save plenty of money and meet some interesting people as well.
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