The very first page of a google search for microsoft expression gives http://www.amazon.com/Microsoft-Expression-Professional-Design-Tool/dp/B000IBZLA0 as a place to buy it.
Nice tool, www.google.com. I can really recommend it for quite a lot of questions. If you don't know it yet, you might find it useful to explore its possibilities.
Hope this helps.
I want to get Microsoft Expression, but since ****Hole Micro$oft took it away from me, I have no choice. This is the only tool that suits me so I can code my webpages. I don't use ASP.NET though. I just wanted to know whether I can buy Microsoft Expression, because it seems as if every store I go to that stocks office products or tech, they don't have it. Is it limited?