PTAC offers PTAC air conditioners from America's leading suppliers including Amana, Garrison and GE.  PTAC's all carry the same measurements so any PTAC can be used in any existing wall sleeve.  Call at 855-770-7195 for pricing on multiple units.  Please not that wall sleeves, grills, and power cords may have to be purchased in addition to the unit depending on the model you select.