You can d/l it for $20 and use the EA promo to get 2 other pieces of content for Mass Effect or Dragon Age basically free when they refund your 800 MS points. Otherwise, cheapest... they're out there for like $15 used.
[quote name='skateraXVIII']On clearance at Target... probably.[/QUOTE]
The platinum hits version was marked down to $9.9x a few weeks before Christmas. You might find it somewhere like a low volume Target.
400 points on Goozex with plenty of offers. I decided to finally bite on that myself yesterday.
Also, Gohastings.com has Dead Spaceownfall (the DVD movie) for $2 + shipping. Add in A 2-disc copy of Event Horizon for $3.50 to make the shipping worth it and prepare for an overload of space ghost goodness.