I found Cabana 2 years ago in the Cherry Hill NJ area Smashburger. The Smashburger on Rt 70 in Marlton, NJ has Cabana, Smashburger in Tom's River, NJ has Cabana, As well as the Vorhees, NJ Smashbuger. They all seem to have the Stawberry and the plain lemonade only. They've all had it upwards of 2 years and still have it.
My East Coast distributor contact says the Cabana Lemonades are doing great at the Smashburgers.