There is a save station next to a blackjack chest in the first area called "Grand Opening" it's in front of a Handsome Jack statue. This is also the very first one you can get in game as well, and so happens to be an easy farm spot.
It's really hard to miss, and it's within the first 5 minutes. Just quit and then reload if you do not hit 21, and the chest is literally right next to you to open.
It took me about 7 reloads, also you do not have to hit 21 on the first draw, you can pay to hit to get 21, or hit again, or even again if needed to get 21, in my case I had to hit twice.Enjoy :)Screenshot of the area in question, it's the first area called "Grand Opening", it's right after you fight a bunch of loader bots after pulling a lever to open the door, there will be an open area, run past this and are stairs, it's at the top of the stairs and save station on the left as well..