My favorite starch by far is a buttercup squash. Unfortunately I am living in Central Illinois and just cannot find them anywhere. If anyone knows where I can find them in bulk I would be happy to drive fairly far.
Buttercup squash are yummy, aren't they? Unlike butternut, I think they tend to be seasonal. You're more apt to find them in the fall, September to December. http://www.specialtyproduce.com/
I know that here, the buttercup pretty much disappeared after Thanksgiving. So sad.
Maybe this next Fall you can freeze some to stretch out the season.