I don't know where you're getting these prices from. In Toronto Boost and Ensure cost CAD$11 for 2000 calories (in bulk at Costco!) while Soylent costs CAD$10.75.

The Soylent has more protein, a more balanced nutritional profile, less wasteful (and annoying) packaging, and is lactose free too.

Edit: and the Ensure has 0 fiber!