I believe the CC deal ends this week. Between selling each version for $20 last week and saving $20 by buying both versions this week, they've already been on sale for two weeks, so I doubt they'll be on sale again anytime soon.
As for the gameplay, I'm really loving it so far. I don't know if anyone has mentioned this, but the gameplay kinda reminds me of War of the Monsters on the PS2, which is one of my favorite games on the system. You basically have the same functions that you have in that game (close range combat, long range combat, picking stuff/opponents up) in this one.
The fighting is easy to perform. Basically you use the X button to pick up things, the A button to punch/kick things, and the Y button to shoot things. You only use the touchsreen to change between vehicle and robot form, check the map, and to scan objects.