These are the minimum parts you'd need to do it:
solid axle - $250
x-over steering kit - $400
front spring hanger kit - $190
springs - $300
add a few hundred $ more for odds and ends.
A SAS would be much cheaper than that though using Junkyard gold. I really want to do one in the near future buuuuut I can guarantee the other half wont let me spend that much on my truck... not in one fell swoop anyway heh >_< Has anyone done a swap using only parts scavenged from a scrapyard? I'm betting you could probably get the cost down to low 200's!
im just gonna rip out the whole suspension out of a 85 yota and fabricate it to fit mine. my grandpa is a mechanic and has a shop with scrap metal and all the know how.