Cream Medium was used from 1931 to the 1960s as a stripe or wheel color. Auto Color Library https://www.autocolorlibrary.com is a source of paint and maybe a formula that your local PPG paint store can reproduce. Looks like you will have to call to get information as the website apparently is under construction or revision.
I am in the powder coating business. Yes, $100.00 seems like a lot of money for a small amount of powder. I think it is 3 pounds. Any time I buy a small quantity of powder, the price is always high. Ordinary powder that might cost $5.00/lb. in a 50 pound box, will cost $12.00/lb. if I only want 3 lbs. Furthermore, the powder being sold by TFS is NOT $5.00/lb powder. It was custom mixed to match the original Chevy Cream Medium. There is not enough demand to justify buying a large quantity so Steve is probably buying it in a 50 lb. box and paying a premium price since it is mixed to order each time. It would probably take a 250 lb. order to bring the price down to a somewhat normal level. Like paint, reds and yellows always tend to be higher priced. Here is the real question. Can you liquid paint 6 wheels with $100 worth of paint?
I didn't mean to imply that you were the complainer. In this hobby, we get accustomed to paying the price required to get what we want/need. I just wanted to put into perspective the probable mindset of the powder coater. We pay $5.00/lb, or less, for most of the powder we use. The sticker shock of a special powder always catches us off guard.
Any special mix whether powder or not is expensive . I just got a 1/2 pt. mixed (single stage) matched for my steering wheel and with hardener and catalyst was $70.00. And that's a shop price not retail. Looking back seeing I am doing a driver I probably should have just got a rattle can as close as I could find.
