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Possible P64 purchase...

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I am on the fence about a purchase of a Polish P64. My local hardware store has one, preowned, asking $150 w/1 box of Wolff FMJ. PROBLEM is:
When I function check it, after decocking, and returning the safety to the fire position, the first attempt at pulling the trigger through double action, the trigger freewheels, like it's disconnected. Second attempt, it works properly. Is this an easy fix, or a trouble spot with no easy or cheap solution?
A deal is not a deal if you have to dump $$$ in it to make it work, right? Obviously, I can't disassemble it in the store to troubleshoot, but with the limited info I have given, are there any solid leads as to which direction I should go?