Per hour cost can range from $150 to $350!
Best advice is to ask a local attorney who does DUI defense. Most will NOT charge for a first visit.
Here are some websites of lawyers. Some are city specific while others are just general.
http://www.san-francisco-oakland-bay-area-lawyers-attorneys-directory.com
http://www.san-jose-ca-lawyers-attorneys-directory.com
http://www.sacramento-ca-lawyers-attorneys-directory.com
http://www.la-orange-county-lawyers-attorney-directory.com
http://www.las-vegas-nevada-lawyer-attorney-legal-injury-defense-directory.com
http://www.austin-texas-lawyers-attorneys-directory.com/austin-legal-services.htm