There are refurbished computers for sale on several websites on the internet from which you can make those purchases. However, as I always tell people who are just breaking into the computer business, I have to tell you this too: you must be quite specific about what type of computer you are buying before you place an order or even go looking for a vendor to buy it from.
The best computers are the ones that come fully packaged and branded from the manufacturers of the product, but chances are that they are quite expensive when compared to computers that were assembled by technicians and engineers with various tools and parts that they brought in from various sources. A processor here, a motherboard there; a monitor from China and a keyboard from Malaysia – putting these things together collected from various locations makes them generally cheaper than you would otherwise have had them.
The fact, however, remains that computer systems, refurbished or not, are always best when they are from the producer, and the factors that most determine their prices are the strength and speed of the processor, the size of the memory ROM and RAM (Read Only and Random Access Memories respectively), and finally their aesthetic appeal. The software applications that come with them also may make a small difference, but you always could just step out and buy those ones at any computer software outlet you are able to locate, and have them installed on your computer in your own time.
You should buy your refurbished computers for sale at a local computer store not far from where you stay, or directly from the website of computer manufacturers the likes of IBM, Dell, Hewlett-Packard, Apple Macintosh, Sony, Viao, or Toshiba. There are other popular and not so popular brand names you can find on the market without having to look too far or work too hard, which you could use while window shopping (so to speak) for your refurbished computers. But if price is really such a huge factor for you, perhaps you should think about hooking up with other online stores and resources like covenco, Amazon, sellyourit, eBay, eCrater, Best Buy, Overstock, or OfficeMax.