Midway has Caldwell Electronic Ear Muffs on sale this month for $29.99. Select USPS Priority Shipping and the NRA round-up and they are just $37. I ordered a pair and may get another before they are gone or off sale. Haven't been able to get to the range yet, but they seem to work around the house. Will be great for a spare pair or to take new people to the range for training.
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=142725
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=142725