Unfortunately in the country we live in it is very difficult to buy a computer, $600 is R$3,100 (Brazilian currency) plus taxes. Minimum wage is R$1302 (251 USD) per month, most people are able to pay a maximum of R$800 (154 USD) for a laptop/desktop or get into debt.
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You really cant find cheaper pc's then around that maximum price.
Look here: https://www.ebay.com/sch/i.html?_from=R40&_nkw=pc&_sacat=0&RAM%2520Size=8%2520GB...
(Ebay) and you might find something cheaper. There you have some computers but it's up to you.
At least they exist so you can get a computer that is what you call today as a decent computer...