Do you sell the complete wiper transmision & motor assembly for a 2011 chevrolet Malibu LT or do they have to be bought seperatly?

If they didnt they can order it an have it shipped to store

Have you ever considered actually calling and asking their current inventory and parts availability, rather than asking a question on a public page they don't monitor or control in any way?

They are usually sold separately at most part stores.