For many videos of matches,
SOAP108.com is your best bet. They have matches of the 2004: Florida and Midwest Regionals, plus all of nationals. For Manchester, I have no source. Email some local teams that
attended Granite State in 2004 and ask around for video clips. Hope this helps.
Plus, if you have some spare time, you and possibly some other team members should just watch a bunch of videos off of SOAP, for three reasons: Inspiration, Motivation, and fun(ivation).
Best of luck on finding the Manchester Videos.
_Alex