If you really want a LSD, some people practically give them away after installing an ARB. I just gave mine to Matt Brown after I had the ARB install and I think he sold it on eBay. If you can afford it, a selectable locker like an ARB is really great, and the rear install is easy compared to the front.
Pete

'01 Rodeo Sport, 5 Speed Softie, Indy 4X rocker bars, OME 912's, Rancho 9000X's, Superwinch hubs, custom tube bumper with Warn 9000i , Flowmaster 50, TeraLow t-case gears, ARB front & rear lockers, TrXus MT's, Sway bar disconnects