Saw a ss grey hawk lock on Ebay but the asking price was north of two bills.
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I also saw a tree hawk lock with a camo pattern finish (should be fairly easy to remove if desired) for $79. The best I could tell from the photos that it was identical to the grey hawk.
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L&R Lock Company makes several replacement locks but they usually require some fitting. I don't know if any of them would work for you, though.