I have some. They aren't particularly for sale, but you never know.... ;-)

OTOH, you can buy em at Petsmart or Walmart for under $10, if you check at the right times.

you may be able to find them at the Aquatic Critter, its in nashville off of nolensville rd. They always have a good selection. Not sure about the prices.

I love that place! Aquatic Critter is cool. :)