After Aurora went out of business Tomy took over the AFX trademark and came out with the Super G+ cars. In 1976 Aurora introduced their first inline type car, the G-Plus. Aurora introduced their A/FX cars in 1971, at the end of 1974 the Magnatraction cars were announced, those were the last of the pancake style cars. X-Traction is the Johnny Lightning or Auto World name for their Aurora Magnatraction clone, any dealer that sells HO cars, including JAG Hobbies and Lucky Bob's, should have them in stock. NOS Aurora bodies are difficult to find, but Model Motoring, Dash and Johnny Lightning/Auto World have done reproductions of some of them. The rolling chassis also pop up on ebay from time to time. At that time the few things that they had left went to Slot Car Central, they have rolling chassis, but not complete cars. NOS rolling chassis are a different matter, when Aurora went out of business REH Distributors bought most of those and sold them by the case until a few years ago.
50 years later you will not be likely to find complete new old stock Aurora T-Jets at a reasonable price. When production stopped Aurora was stuck with at least a million chassis and the complete cars were sold quickly at a reduced price.
The bodies for those cars were made by Aurora in the US, but the chassis were made in Asia. The original Aurora T-Jets went out of production around 1972.