I've been shopping for a new case with a P4 power supply for a couple of weeks. I've chased down links from pricewatch, forums, and searches and came to the conclusion that if the price is low, the shipping will be high and vice-versa. After all the work, I bought one from Newegg because: 1) If there was a cheaper price, it would only be a couple of dollars, and 2) They are reputable and ship quick.
My .02! HTH.