No, you will pay about 30% more through dell. Go to crucial.com, enter in your computer information, it will provide you with the exact specifications of the type of memory you need.
Then, go to newegg.com, zipzoomfly.com, crucial.com, ebay etc and price your ram out at these places. It will be considerably cheaper. Crucial, Micron, Samsung, Kingston are all good brands. Other people may offer more suggestions.
How much memory, total are you looking to have in your computer?