About how much em I approximately going to pay when trying to fix someone's legal status.

Consult with an experienced immigration attorney. When a person has been deported or taken voluntary departure twice the process is not going to be easy. Depending on how he entered the USA on those two occasions and why he was deported he may not be eligible to return.

I agree. It also depends on when the voluntary departures took place and how much time he had in the US prior. You need to speak to an experienced immigration attorney in private.