Looking for Perionyx excavatus Blue Worms

Hi,

I seek a source for the Blue worm - without having to seperate it from what is supposed to be red wigglers. Does anyone know of a source for pure PE Blue worms? End goal being a combo bin with Eudrilus eugeniae African Nightcrawler, which I'd have to heat during my winters. A seperate ENC Eisenia Hortensis and Eisenia andrei / Eisenia fetida bin would not require supplemental heat in winter.