Pet stores sell ceramic heaters for reptile tanks (no light) in various wattages or you could go the FermWrap route....you can buy the stuff by the foot at - The Bean Farm and make your own with an old extension cord and soldering iron.
Something is always fermenting....
"It's Bahl Hornin'"
Kegged: Sour Saison, Pale Ale, Aggie Ale, Firestone DBA, De Koninck Blonde
Bottled: Belgian Quad (Grand Reserve), Derangement (Belgian Dark Strong)
On Deck: Pliny the Younger