I suggest that you state in your ad (caps) 'Cash only, no checks' any bills over $20 will be checked at the local bank. This should be sufficient to stop (or limit0 the scammers. If you are selling expensive items you might also reference using a public place like the local police station or bank to complete the transaction.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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