They are not the cheapest computers you can buy. You can buy “no name” “white box” PCs. But “white box” PCs are often they are made of unreliable/short-life components.
But wait! There is a way to get cheap Dell computers, often with a full warranty. And you can do this by visiting the “Dell Outlet” sites. Where they offer Refurbished (aka “Scratch & Dent” ) or Pre-configured systems.
“White box?” – generic PCs built by computer shops. As it a competitive market, computer shops compete on price, often at the expense of reliability.