I accidentally bought a 5-pack of these off eBay thinking that I was only ordering one. I can't return the extra ones, so I am going to keep 2 of them (meaning that I have 3 for sale). I am selling them for $20 shipped to the contiguous 48 states (PM me if you live elsewhere and we can work something out).
Here is the same item at Amazon: http://www.amazon.com/Eva-dry-E-500-.../dp/B000H0XFD2
Like I said, I have 3 for sale. All of them are unopened and in retail packaging. These are good to place inside a kegerator or fermentation chamber to keep moisture from building up and causing mold, damaging wood panels, etc. Basically, you just sit it or hang it wherever you want and let it suck up all the moisture. After a while (usually a few weeks), you take it out and plug it in for a couple hours to renew it, then you put it back in your kegerator or wherever. I thought it was pretty cool that you only plug it in to renew it, and it isn't like Damp-Rid where you have to keep adding more.