I too like golf cart batteries. But these are usually the old style flooded cell lead acid types but are one of the few with real deep cycle capability. They are about $100 each at Costco and other places.
AGMs or absorbed glass mat batteries are also good for the reasons Shrew noted above and as best I can tell there is no difference between starting and deep cycle batteries.
Amazon has Renogy and Windy Nation 100 Ah AGMs for about $200 each. These are the cheapest I have found. You can pay as much as $300-400 each for Lifeline or other high quality brand AGMs.
David
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