Junonia (junonia.com) is probably the best online source that I've found. A couple months ago I discovered Catherine's (maybe I should say RE-discovered them). They used to have really futzy, old-lady tent clothes, but are much changed. Anyway, they had an awesome selection of plus-sized workout clothes. Everything from jogging suits to yoga pants & shirts--and reasonably priced.
Ah! I just checked online and Catherine's DOES have their stuff online at this link:
http://catherines.charmingshoppes.co....aspx?attr=915 I actually have those capri-length "active cropped pants" and LOVE them (they fit kind of loose, NOT TIGHT) as well as the pink top just to the left of them.