The Dell items at Discount Electronics are usually Dell products that are no longer in production, off lease or refurbished. Most of the computers that I have seen are off lease. The hard drives will have a new operating system installed along with the freebie MS Office look-alike stuff. The operating system will probably be XA or 2000.
They also have a lot of LCD monitors. I replaced all of my CRTs with their LCDs. (I run about ten computers doing various weather and amateur radio functions.)
I could not find anyone that wanted the old CRTs.
They also have some limited Apple items that I can not evaluate since I know nothing about the product line.
Their laptops are older and thus do not have the glossy screens that are awful in an outside environment. In a car, the glossy screens make a good rear view mirror.