I did some searching on the web and discovered
Ametherm has a nice line of thermistors including these with a cold resistance of 220 ohms.
1 Amp max, 2.2 ohm hot
http://www.digikey.com/product-detai...873490?cur=USD
2 Amp max, 0.9 ohm hot
http://www.digikey.com/product-detai...873476?cur=USD