A million dollars a plane would break a lot of airline companies. I don't know if there are cheaper solutions. I know a lot of work is being done on systems that would be located at or near airports to "blind" missiles. Fixed systems would be cheaper, since you don't have to equip each plane separately. These missiles only work at relatively low altitudes, so a local solution around an airport or on approach and departure paths is workable.

Fortunately, multi-engine large jets are less vulnerable to a missile strike in an engine nacelle than a fighter jet would be. Still wouldn't want to be in a plane that got nailed by one, though.