Board Thread:Questions and Answers/@comment-62.252.7.121-20140905184240/@comment-128.2.123.69-20140910163924

You can earn gold by increasing your level (from Fame points). About 20,000 gold is available this way but each level takes more fame than the next so it could take a long time.

Also be patient and wait for cars to go on weekly sale. I try to buy cars only if they're at the 20% showcase price, but they do cycle through at the 40% weekly sale price. Right now it's the Agera R for 480 gold when it's usually 800, so you can save a lot there.

For example, if I add up the price of all Gold-only cars that I do not own yet, it's 4930 gold that I would need to complete. However, if I buy only at 20% off, it will be 3944 instead. If I'm patient and wait for the 40% off sales, they will be 2958.