The cheapest you will find one of those is ~$700 though. To get something at $500 you will either need to make a compromise in performance or battery life. If you prefer good battery life, an E-450 based laptop would be fine. I have the MSI X370 myself and the battery life is insane, I can get 10 hours of light use if I'm careful.
You should be able to find the X370 for $500.
If you would prefer to sacrifice battery life for performance, you could go for basically any i3/i5 or A6/A8 laptop.
I said 5-10 hours. I didnt really expect that I would get a laptop with a 10 hour battery, it was more of a hope. Also I said that I was going to buy a laptop at bestbuy and that the companies i prefer were in this order samsung, asus, dell, and hp as a last resort. I think I have already made my decision but I wanted a second opinion.
When I said 5-10 hours I didn't mean I was going to sit there and use it for 5-10 hours straight. That was also including standby and sleep mode, etc. There are i5 laptops that can get 7-8 hours on a single charge so I dont know why an i3 would. Of course those laptops are usually not $500 and the laptops I want probably have smaller batteries. Thanks for you help though