YEG - Frozen Butternut Squash
Save On should have small (albeit pricey) bags of frozen butternut squash in the organic aisle-Stahlbush brand I think. Otherwise I second the Costco suggestion--particularly after roasting and cubing two large ones myself the other day. Btw they're usually in the walk in cooler (with the baby carrots, fruit trays etc).
The downtown Planet Organic came through with the Stahlbush brand butternut squash. Luckily it was on sale so definitely a better option than peeling and cubing them myself.
I don't have a Costco membership so I wasn't able to try that but I'll find someone to tag along with the next time I need some. That would definitely be a cost effective and efficient solution.
Thanks to everyone for their replies.