Wal-Mart doesn't really carry a large selection of computers. The ones they have might not be the best for online gaming. Check a local Best Buy as they may offer price matching as well.
you can buy it in your local gaming station or eBay
A gaming PC case can be purchased at Tom's Hardware, New Egg, UK Gaming Computers, Game Nexus and Main Gear online. A gaming PC case can also be found at Best Buy and Future Shop.
The best way to buy a gaming laptop is in a store where one can get acquainted with different computers' functions, ask questions of the experts there, and find the computer best for one's purposes. Alternatively, one can buy a gaming laptop at many online stores.
You can most likely buy it at your local Best Buy, or gaming/ electronics store.
The Internet has what you need, you can try. www.ibuypower.com/ Custom Gaming PC - 10 years of award-winning Custom Gaming Computers & gaming laptops custom-built for PC gamers.
You can find reviews and pricing information for computers that are primarily for gaming directly at the sites of retailers which sell computers. Good places to check would be Best Buy and Future Shop as well as at online shopping sites.
There are many stores in Dallas, Texas that sell gaming computers. The store that I would recommend is called CompUSA Computer & Electronics Store.
eBay,or possibly your local gaming store.
Gaming computers can be built by the user for a rather cheap amount but some companies will sell you computers that are already built and will be ideal for gaming. One of the best companies that sells gaming computers is Alien Ware.
yes
Antec and Raidmax make very highly recommended cases for gaming computers.