You would get a lot more bids if you set a flat rate shipping amount. Saying exact shipping scares a lot buyers off. After a buyer wins you could then state shipping is $10-15 which I've had sellers do. When this can ship for $3-4 using USPS First Class with tracking. Also, if you don't accept PayPal, the safest method for both buyer & seller, then what do you accept?
Oh gezz...so you won't disclose the shipping amount & you only accept cash. The most unsafe way to do business on here for the buyer. Good luck with you auction. I'm no longer watching.