said by stet:The rest of the episodes will be on sale tomorrow.
Actually the sale started early! Episodes 2-5 are 50% off through tomorrow. Episode 1 (AKA the "Full Game" download) is still free. All can be purchased and queued up to download to your Xbox from the link above.
I essentially got the entire game for only $5 since I bought a bunch of points at Target for 50% off on Black Friday