I picked up a couple of new G-Shocks from Walmart today. They had the G-7301V-1V with nylon strap, marked down to $25.00. Heck, it's worth it for the spare solar battery, great nylon strap and strap adapters.
I also grabbed the DW56RT for $20.00. I originally bought it for the strap and bezel, to use as spares for the GW-5600. But this referee timer is starting to grow on me. The display in timekeeping mode is simply outstanding. Wonderfully legible. I'm going to have to play around with the module a bit and see how it works out for me.