I am looking for an emal address for my half sister.I have never met
her or spoken to her. I believe she lives in Arizona,she was born in
Tucson.Our fathers name is Malcolm Harvey and her name was Marilee
Harvey.I dont know if she has ever married.She would probably be in
her 40's.

Call these folks and ask around:
http://www.dexonline.com/servlet/ActionServlet?pid=rresults&form=ResWhite&from=&PREVIOUS_PAGE=rsearch&lastname=Harvey&firstname=M&city=TUCSON&state=AZ&metro=1&Search+The+Listings.x=39&Search+The+Listings.y=11

The first three look like they might be good leads.

Thank you,I have been doing a lot of searching and think maybe her
last name is now Wojcik. Still cant find an email address for
her.Intellus and net detective say they have the info,but I didnt want
to pay for a subscription to use once.I was hoping someone here
already had a subscription and wouldnt mind checking for me.

GARs are supposed to use publicly accessable databases and
information, not pay services...

Try this page:
http://www.dexonline.com/servlet/ActionServlet?pid=rresults&form=ResWhite&from=&PREVIOUS_PAGE=rsearch&lastname=Wojcik&firstname=&city=TUCSON&state=AZ&metro=1&Search+The+Listings.x=67&Search+The+Listings.y=13