sell computers in use almost batch or cpu, screen, disc, memories ?

I have bought a laptop for my daughter going to school and it has worked out great.

They are a used computer reseller. They buy used equipment, refurbish and sell it to the public. I have never bought used CPU's from them. I have bought complete systems, memory, hard drives, SSD's, laptops, keyboards, mice, speakers and monitors from them. In quantities of 1 to 50 at a time.