Typically like most vendors
when you buy online the laptops are configurable and if you buy at Best Best, Newegg or retail outlets they are non-configurable.
Buy configurable i mean you can add more memory or bigger hard drive and with this model you can get a better type of screen.
If you buy from say Best and want a bigger hard drive it would be handled like a separate deal and you would pay labor and the part and might have warranty issue. If you get it configured at Lenova you just pay for that option and there wouldn't warranty issues aren't as bad.