Casio G-Shock with Atomic Clock Reciever Casio's web site lists an MSRP of $150 to $200, but I've seen these for less than $100 (I got mine at Costco for $70. Also check Target.) It's tough. It uses solar power to re-charge the batteries. And since it gets a signal from the atomic clock transmitter in Ft. Collins, Colorado, you never have to set it.