i love deepdiscount.com for dvd's. huge selection and they have some hard to find stuff too at low low prices and the shipping rate can't be beat...FREE! Everything ships standard USPS free regardless of size the order. If you want expedited it's still cheaper than most places standard shipping.
I like shopping on www.kohls.com for sale items, with free shipping, and a coupon code for an extra 30% off.
One of my favorite price comparison sites that I use is www.nextag.com. You just type in what you are looking for, and it will pull up the prices off of the internet so that you can see where to get it the cheapest.