This may (or may not) be US only, but if you have a PS3 head on over to the PlayStation store right now.
Go to the Video section.
Scroll down to (or search for) Armored.
You'll see "Armored Digital Copy for PSP" with a price of nothing.
Best part is, it's not a rental but a purchase.
Consider the movie hasn't even been in theaters a month it looks like someone at Sony screwed up pretty big. :)
Snag it before it disappears.