In the past week I ordered Terror Train, Death Valley, and The Funhouse through dvdplanet mainly because they had the lowest current online retail price, but I think that Shout's prices are pretty competitively priced. Especially in comparison to other video labels who for some strange reason usually insist upon selling at full SRP on their websites. I may very well go through Scream Factory direct next time around and give them my full support!
edit: uh... after reading after the fact on everybody's reports about Shout's customer service, maybe not!