brass can be purchased new from Ellwood Epps and WSS among others.
Lee makes a 2 die set that lists at $31.95
factory rounds are available if you want to pay the price.I've seen them from $30-$100/box.
The last gun show I was at had multiple $40 boxes.
from the data I've collected,muzzle velocity tops out under 2000fps with safe handloads.factory seem to hover around the 1400fps mark.
this from my notes:
Introduced in 1884, the .32-40 Winchester would become quite popular on the match circuit, and would come to be associated with a legendary target rifle of the period by earning another name, the .32-40 Ballard. The cartridge would eventually also be chambered in popular "working" lever-action rifles of the period. The .32-40 and the .38-55 Winchester were the first cartridges offered by Winchester in the 1894 rifle. Marlin, Savage, Ballard, Bullard, Kennedy and others would all come to offer rifles chambered in .32-40.
Initially, the round would use 40 grains of blackpowder to propel a 165-grain flat-nosed bullet but would eventually be adapted to smokleless powder. The .32-40 was used by wildcatters of the day as a basis for custom cartridges of improved performance, such as the .33-40 Pope.
In it's high-velocity form, the .32-40 is adequate for medium-sized game such as deer. However, as with all cartridges of history, one should not use high-velocity rounds in firearms of the oldest vintage. Regardless of the age of the firearm to be used, insure it is structurally sound, even for use with standard ammunition.
Obsolete for many years, the .32-40 gained a new lease on life in the 1970s and 1980s when Winchester reintroduced it in their John Wayne commemorative rifles. The rise of Cowboy Action Shooting and NRA Blackpowder Cartridge Rifle competition has also helped prove that few cartridges ever really die in the United States.
The standard factory 165 gr. load exited the muzzle at 1440 fps and 760 ft-lbs. High-velocity offerings raised that to 1752 fps and 1125 ft-lbs.