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Amazon [amazon.com] has WALKER'S Single Mic Compact Folding Sound-Enhancing Electronic Muff + $1.10 Amazon Credit for $12.79. Shipping is free w/ Prime or on $35+.[LIST][*]Usually ships within 2-4 weeks[*]Promotional credit will be automatically added to your account 30 days after shipment. At that time, you will receive an e-mail from Amazon that indicates the dollar amount of the promotional credit and that the dollar amount of the credit has been added to your customer account. The e-mail will also provide instructions on how to redeem the promotional credit.