Keep an eye on your TV listings for QVC. Creating Keepsakes has a segment on sometimes with scrapping supplies and the other night they had a 150 piece set of cardstock in both solids and patterns on special for $19.95 or something like that. They had great deals on bulk stickers too.
I buy tons of stuff from Keeping Memories Alive http://www.scrapbooks.com They have great prices and really good specials in their "Sidewalk Sale." Their prices are good and their delivery quick.
funny- just ordered from KMA last night.. I love their stuff.. ordered solid cardstock for the first time, normally I order the cottage collection grab bags.. but this time I need more solids, so bought the 100 sheet of 8.5*11 and 50 sheets of 12812 cardstock packs... and some individual papers, as well as a new paper taker- almost the cheapest price on the web, when combined with the rest of my order (including some punches) it was the cheapest since punches are so heavy and the only place I foudn the paper taker for less charges actual shipping.. spent 49.95, so was just under their second shipping costs tier... well worth it!