PB
You may be surprised. The SAS may be cheaper than all the "custom" stuff. One-off's can cost mucho dinero $$$$$$$$$$$$$. For a linked SAS you basically need an axle ($200-600 at u-pull lots), some tubing for the links, joint end of some sort, mount brackets, shocks/springs and a steering set up. If you have a local 4x4 fab shop swing by and talk to them. They can probably give you a rough idea of cost. If you plan on running the big meats the SAS is definately the way to go...unless of course you like trail repairs!