EDIT2:
Ugg. Turns out the person I had talked to was wrong and walmart.com purchases do not work for the discount.
I found a $498 i3-4130, 8GB RAM, 1TB HDD, DVD drive, Windows 8 computer (didn't mention GPU so assuming no GPU). That's about $373.5 after the discount so I'm going to go get it in the morning.
I didn't even end up building a computer, but I will after Skylake CPUs get released next year
EDIT3:
For the people only having read the opening post, the discount I talked about is the 25% discount on one transaction I get from Walmart from having worked on Thanksgiving.