You want this Worldbuilder’s Toolkit 7 Bundle of Holding.

More specifically, you want the Suppressed Transmissions and the Robin’s Laws that come when you pay more than the threshold.

Link. The first Suppressed Transmission in particular is retailing in the cusp between three and four-digits, which means that Steve Jackson Games should add it to its Print on Demand service (although that’s an argument against interest on my part, since I have a copy and the kids will need to go to college eventually). So spending twenty one bucks to get the PDFs for that and the Laws is pretty much a no-brainer, if you don’t have the originals.

Oh, and I’m sure that the rest of the stuff being offered in this Bundle of Holding is all right, too.