Home Depot is selling DriCore panels at $6.97 a piece
Lowe's has both DriCore & Barricade options at $7.99 & $8.99 respectively
Certain Home Hardware locations also have both (North York) at $6.49
It would be useful to toss in the price of some rigid foam insulation as a possible add-on. I think if someone were to choose the DeltaFL option with some OSB, it would be worthwhile to add a layer of foam for extra warmth.