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Full lenght sub frames cost about $100. You can install them yourself if you know how to weld. A lift would be helpful, but if you have jack stands, you should be able to do it.
The suspension needs to be fully loaded when they are welded on so you will need a place that has a drive on lift. Shouldnt cost any more than $75. If you have it on jackstands you run the risk of your body being tweaked and then welding it that way.