Arlene try here and choose.
http://www.amazon.com/s?ie=UTF...
They are all about the same the more you pay the more reuse you will get. I have tried 3 of them. If it is hot 90s I keep 2 in the freezer and use those. It works for 3 hrs frozen. If it is in the 80s I use the fridge ones and get about an hour.
If you want to really try this idea cheap if you have some of those soil moisture crystal get a band from the dollar store and put some of the crystals in the band wet and freeze. It works good. Especially if you can find the terry cloth shower head bands.
Caroline, the weeds have almost choked a lot of my grass so when I do not mow or water it looks green I am letting the clover win. The rabbits and bees love it and they are leaving my plants alone.
