Just for fun: www.athleta.com

They don't have any running rain pants right now (maybe in the fall) but all their pants are belly-button or lower. They have a cute categorizing system for how far below the belly-button their waistbands land (1 finger <index> 2 fingers <peace> 3 fingers <scout> etc.)

Have you tried Lucy of Portland? I think it's just called "Lucy" now. www.lucy.com (i think)

SportHill specializes in running gear. www.sporthill.com And there's always Brooks www.brooksrunning.com