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I picked up this marine 24v inverter from craigslist for $50 or $60; I forget the rating but I can look later. A lot of boats use 24v so that's one place to look.
EDIT to add: I routinely troll cl for stuff, using search terms like 24v, 24vdc, 24 vdc, 24 volt, and 24 volts. You never know...