I got my silver, .9999, from an online jeweler supplier, bought my alligator clips at Radio Shack, stripped the end of the wires on some old wall warts (DC adapters), and made my own for about $5 each. I got enough silver to make several as Christmas presents. My own has extra-long silver rods, for use in a one-gallon pickle jar. I tape the alligator clips to a section of plastic coat hanger that's long enough to reach across the top of the jar. The wall warts only feed 12 volt into the water, but I've heard that the slower the brew, the smaller (and therefore better) the size of the particles.
I highly recommend getting a TDS meter. You can get one on ebay for about $20.00.