The earliest you can get this in a new game (suggested) is on Tanton (the starting planet), a few missions in. You'll be tasked with going to a hideout in the Oil Refinery and eventually have to fight a laundry machine.
Depending on you class selection, you may need to bring some health and revive items, but regardless, you'll want to keep the weaker character up front so they pull aggro and get KO'ed. Once that happens, finish off the boss.
I actually had to wait a few turns for one of my characters (lvl 2 going into the fight) to be KO'ed so I could nab this.