I'd avoid the used laptops for very simple reasons. Most often the laptop is on it's last months to a year. Laptops do not age well so my advice is to keep your money.
I want to buy a used lap top just to access email and my store on etsy and to google information. I need one with a keyboard larger that what seems to be standard. I saw someone with one which had a keyboard like a standard computer keyboard. What kind would that be? Would it do what I want it to do? I cannot pay a lot of money since I am on a fixed income.