It's pretty expensive to get it rebuilt, usually not worth it unless it's a really nice turbo.

You can do it yourself in ~1 hr

Get a rebuild kit ~50 bux

Take it apart, install new parts from that kit

take off the turbine shaft and compressor wheel and nut, and get it balanced at the turbo diesel shop in forest park ~50 bux

~100 bux total...

Only oddball tool you'd need is a nice set of snap ring pliers, other than that a 1/2 solid wrench. Sometimes you NEED a 12 point 7/16 socket to get the compressor nut off. Use a vice to keep the turbine shaft still while you tighten/loosen it.