A while back Rodeo Games released Warhammer Quest, and it was good. Quite good, in fact. It garnered a fair amount of praise even before releasing new campaign DLC. And now it's been chosen as Apple's App of the Week.
So basically Rodeo's critically acclaimed and (arguably) best tactical RPG to date is currently free. Totally and completely free. You'll still have to cough up a few bucks for the extra content of course, but I mean come on. Free Warhammer Quest. Download it!