One word-
Spaghetti Squash
(ok fine, two words)
This big fella was about $6.30 (USD) on Post. So....obviously not cheaper than boxed pasta, but super healthy and super yummy!
I cut it in half, stuck in the oven for about 45 minutes at 400 degrees F and then scooped out all the insides and put them in a pan with a homemade tomato sauce that had been simmering. Little sea salt and voila! Dinner.