You probably do have some MN in pure white. It used to only come in pure white to match the LED light links. Last season their entire inventory was sent over in classic white by mistake, so they are now only offering in classic white. It's great for coordinating with warm white C9's, but not so much for pure white C9's. I re-strung some with PW last year, but it was too time consuming.
I was surprised how many people wanted pure white here. The mix was probably about 50% warm, 40% pure and 10% multi or solid color.
I just received a sample of Sierra garland from Brite Ideas. It's nice and full and comes in every color. It's not nearly as nice as the MN, but I think I may go with it on my pure white and color jobs this year.