By JON GAMBRELL Calling Batman: Cave owner Steve Rush has a deal for you. Rush, 49, is auctioning off the Mystic Caverns in the hills of Ozark Mountains on eBay. The 28-acre property in Arkansas includes a gift shop and three caves, two of which are safe enough for visitors. The bidding starts at $899,900, cut from Rush’s original asking price of $1.2 million. Rush bought the property near …
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