As of this month, Starline Brass is now making .32 ACP cases. While the round’s popularity has waned during the past several decades, interest in the cartridge has picked up with the return of the reproduction Colt 1903 pistols.
Starline Brass will sell the brass cases in bags of 500 and 1000. 500 pieces will sell for $88 while the 1000 piece lot will sell for $150. Due to the relatively low pressure of these rounds, I would expect that a purchase of either quantity would last the average reloader a long time.
Note that Starline is not producing .32 ACP ammunition. This article refers only to the brass case, which is only one of the components that make up a complete round.