Possible? Sure! Cheap enough to make it worthwhile? Hells no. Maybe you could get the cost per invitation down to ten bucks if you really had economies of scal

Possible? Sure! Cheap enough to make it worthwhile? Hells no. Maybe you could get the cost per invitation down to ten bucks if you really had economies of scale and the cooperation of the cell phone networks. But who wants to pay ten bucks just to invite someone somewhere? For that money I'd rather provide two more free drinks to everyone at the party.