Cheap place for last night?

[Mocharilla]

So, we want a place around $40-50 (pref. less) for our last night, since our flight leaves early. Motel or whatever.

But, we won't have a car, so we'd like somewhere with an airport shuttle.

Is this totally out of the question? Cab fare is outrageous, and we'd prefer to spend as little as possible on a cab.