Anyone know how much one would cost?? Or where to pick one up from?

They are all over eBay. You can pick up a complete vg30det (twin turbo) engine (wire harness, ecu, bolt on's) AND and 5 speed turbo tranny or auto turbo tranny with no more then 60,000 miles on them for 1100-1500.............Also comes with a 6 month warranty

Do a search for jdm engines.