If your doing the work yourself it won't cost to much. Mostly just time. The 44's can be picked yp at a local junk yard for well under $400. Springsand shocks aren't too exspensive. Some tubing, joints and Brackets is all thats left.
Here are some links to some places that sell that stuff...
Poly Performance
More Zu specific...
Independent 4X
Darlington Offroad