I used to find them by the bucket load after law enforcement agencies had their practice at our range. I guess my suggestion is find out if there is a local range where you can scrounge them. Dumpster diving, a great pass time. I also found a 5 gallon bucket of mixed 45acp, 9mm, and 45 S&W brass. After sorting it and keeping all the 45ACP, I sold off the rest for a penny or two a case.