Two common amorphous transparent commodity plastics are PS and SAN. PMMA is also in some instances classified as a commodity plastic.
Amorphous transparent PET (APET, A-PET) is used in the preforms of blow-molded PET-bottles. Its heat resistance is poor, which you can experience by filling a soda bottle with boiling water.
PP Random Copolymer (PP-RC), is also a commodity plastic and a semi-crystalline exception among the amorphous alternatives. It is always at least slightly milky but has many advantages (chemical resistance, ductility, use of integral hinge) most of the amorphous materials do not offer.