Took a while to find it, and it doesn't show up reliably on the Vita Store page for some reason, but was able to order Rayman, MvC3, and Wipeout.
Here are the games:
Hot Shots Golf
Ultimate Marvel Vs Capcom 3
BlazBlue: Continuum Shift Extend
Dungeon Hunter Alliance
Army Corps of Hell
Ben 10 Galactic Racing
Michael Jackson The Experience
No idea why repeat visits to the Amazon Vita Store don't get the 2 for 1 to show up, but I saw it briefly, ordered, and saved the address to post here. Worked fine for me.
Edited by slappynutz, 21 February 2012 - 06:22 AM.