Why don't you try google it is full of them .

Here is the list of some Free Press release sites:-

http://pageup-pressrelease-network.com
http://arizona-pressrelease.com
http://atlanta-pressrelease.com
http://austin-pressrelease.com
http://baltimore-pressrelease.com
http://boston-pressrelease.com
http://buffalo-pressrelease.com
http://california-pressrelease.com
http://charleston-pressrelease.com
http://charlotte-pressrelease.com
http://chicago-pressrelease.com
http://cincinnati-pressrelease.com
http://cleveland-pressrelease.com
http://colorado-pressrelease.com
http://columbus-pressrelease.com
http://dallas-pressrelease.com
http://denver-pressrelease.com
http://detroit-pressrelease.com
http://florida-pressrelease.com
http://georgia-pressrelease.com
http://hawaii-pressrelease.com
http://honolulu-pressrelease.com
http://houston-pressrelease.com
http://illinois-pressrelease.com
http://indiana-pressrelease.com
http://indianapolis-pressrelease.com
http://jacksonville-pressrelease.com
http://kansascity-pressrelease.com
http://lasvegas-pressrelease.com
http://losangeles-pressrelease.com
http://maryland-pressrelease.com
http://massachusetts-pressrelease.com
http://memphis-pressrelease.com
http://miami-pressrelease.com
http://michigan-pressrelease.com
http://minneapolis-pressrelease.com
http://minnesota-pressrelease.com
http://nashville-pressrelease.com
http://nevada-pressrelease.com
http://newjersey-pressrelease.com
http://neworleans-pressrelease.com
http://newyork-pressrelease.com
http://newyorkcity-pressrelease.com
http://northcarolina-pressrelease.com
http://ohio-pressrelease.com
http://oklahoma-pressrelease.com
http://orlando-pressrelease.com
http://philadelphia-pressrelease.com
http://pennsylvania-pressrelease.com
http://phoenix-pressrelease.com
http://pittsburgh-pressrelease.com
http://portland--pressrelease.com
http://saltlakecity-pressrelease.com
http://sanantonio-pressrelease.com
http://sandiego-pressrelease.com
http://sanfrancisco-pressrelease.com
http://sanjose-pressrelease.com
http://seattle-pressrelease.com
http://tennessee-pressrelease.com
http://texas-pressrelease.com
http://utah-pressrelease.com
http://virginia-pressrelease.com
http://washington-pressrelease.com
http://washingtondc-pressrelease.com
http://usa-pressrelease.com