"Not in my country. You go to Staples, WalMart or Best Buy and you have no choice."
So you have no choice in Staples, Walmart and BB.
Sigh. You probably can't buy coyote urine in those stores either but that doesn't mean it's not available in your country.
HP's website offers customization. The default for computers is Win8.1 but you can change it to Freedos or SLES 11 and the price goes down $125. Dell offers computers preloaded with Ubuntu as well, and there's plenty of boutiques that sell fully customized computers with a non-Microsoft OS or no OS at all.
Saying that you can't buy a PC without Windows in the US (I based your location on your comment history) means you're either lying or you just don't know what you're talking about. Which one is it?