Hello, I was browsing through Web-tronics' online catalog and came across this page: http://www.web-tronics.com/ntcthermistors.html I'm not sure what the 380+/- 300 means for the 1K listing... but could it be the ppm rating? If so, this is a cheap source! They also have CA 3019 cans for those of you with MS50s. Romeo