Most non-specialist stores, including office supplies chains.<p>Some of the discounted PCs, typically configured with Windows Home Edition, won't even work properly with Linux. I destroyed an Asus notebook's motherboard by reformatting and installing Ubuntu Linux. The tech who diagnosed it suggested that the Linux drivers may have set some I/O registers in a way that caused the fault.<p>"Bargain PCs" tend to be manufactured to a very low cost, so they have many compromises in order to meet those targets.
In my experience, big box stores offering employee incentives for moving specific items into your hands.<p>Usually they'll try little sales tricks like "I don't know when the one you want will be back in stock, if ever. But we have this one today and I brought it out to show you. Great deal."