For practice ammo, I like Wisconsin Cartridge company, Parabellum Research, Highland lakes, HSM (Hunting Shack Munitions), Northern Hills precision and several others.

For JHP, there are many - Gold Dots, HST, Winchesters bonded JHP's

Here is a link that will take you to some good links:

Links to Ammo sellers! | Glock Forum at GlockTalk.com

also ammoseek for others !

357sig ammo handgun

OH! Also - Precision One ammo is some good stuff!!