Just to follow up, got my kits more than a week ago.
FWIW, there were a couple of trivial issues that may explain why they were on sale. The Frenzy has some mismatched fins - nothing drastic, about 1/8" - but enough that I will need to sand/grind the root edges down. Also, the "white" tube of the Avalanche is not what I was picturing - more of a translucent light gray, as opposed to the usual translucent pale green, so I may wind up painting it after all.
Don't take that as a complaint, I really did mean trivial, and I'm quite happy with them, especially at the sale price.