Fermenter Heater Wrap Around Heater 110V/32WMore Info
From the product description, check product page for current description, price and availability:
Heat Wrap covers a wide area of your carboy or fermentation vessel, promoting an even heat distribution. Using tape to adhere, it can be attached directly to your fermenter. You can increase the temperature of your ferment from 5-20 degrees Fahrenheit. To decrease the temperature differential, stick only a portion of the FermWrap to the fermenter. 32 watts of heat spread over almost two square feet, it provides gentle even heating.
As if this posting, this is eBay offering is selling for just $14.99. Shipping is also free to many US addresses.
Alternate Use Tip
I use a similar heat mat to help remove stubborn keg labels. See: Removing Keg Labels… A Trick That Makes it Easy! – a section of our keg rebuild how-to