Not nearly as turnkey, but for a little extra fun you can also build your own battery bank from reclaimed laptop batteries. Search youtube for 18650 battery bank.
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Actually, if you want a (relatively) cheap battery bank for solar, find a place to sell you used golf cart batteries. They are typically 6 volt, but are deep cycle (big and heavy). Wired up properly, they can work really well, and cost a fraction of what new batteries would.