I have done a lot of research into the computer build I'm looking for. I shopped around and found that walmart sells the computer with the build your own option for $300.00 less than getting the parts separately, and $150.00 less than the configurator they have available on newegg. I already know that I will want to upgrade the power supply asap after getting the computer. how is it that walmart can sell them so cheap is there something I am missing?