They're not worth it. Boost labs are too hard to get to although they are a neat puzzle. Look for Fritz in the underground. The first thing to do is to go to Joe's Bar. It's a building north and two to the east of where you start the game.
Spider is in back, behind the bar.
He's lying down. Now, he'll ask you to go to Johnnie's Corner to see Reggie, who will tell you a password. It isn't necessary to get the password, but if you don't, you'll need to get a loan off Brehm's Bank at loan-shark rates. Even Brehm tells you the way you should be making money is by killing robots. Searching for and finding energy cells and selling them at 5 credits is another, but it's a little more tedious.