Read his helpful hints before you buy. This includes a monitor, and often a printer.
Cost go up from there depending upon additional options.
The best bet is to shop around first, starting with wholesale stores like Price Club. Browsing here offers a no-pressure approach to finding the computer system that fits your needs and price. Take notes and look for package systems that include the printer, a monitor, and software. Try not to buy a computer your first time out, and look for brand names. Once you've narrowed down at least one system package and price, visit your local bookstore.