What about black market space ventures?
This where I really have to plug Victor Koman's
Kings of the High Frontier. A dynamite book, and it won a Prometheus before its first dead-tree publication. Yes, it's a bit dated now (hard to predict those shuttle accidents), but still a damned fine read with some good ideas. Vic did some damned fine research.
The original publisher, pulpless.com is nonfunctional. Hardcopies are at
http://www.bereshith.com/frontier.htm and have a much better cover than my download. I own the book in HTML ( from Pulpless, I bought a dozen or so extra licenses to hand out disks to folks at several edges of the Nolan chart and I used them all up -- that took a bit of communication between me and J.Neil, because the system wasn't set for multiples), a signed floppy with the Word document (Vic gave it to me when he got his Prometheus in San Antonio) , and the beautiful Bereshith hardcover.
I repeat, I recommend this book. If I had the authority, I would recommend this book to whatever deity is currently supervising this planetary system. (I doubt there is one, but I'm a fewking atheist, so how could I know? God spoke to Oral Roberts, Billy Graham and Jerry Fallwell, he doesn't say shit to me).