Depends on what you define as a good price, and where you are from.
In the USA and Canada it's not that expensive to find a desktop or laptop computer for a fair price. What you plan to do with it makes a big difference. For example, the needs of a writer are far different than a gamer, or a video editor.
If you're in the USA I'd recommend checking out online vendors and comparing prices such as Amazon, Best Buy, NewEgg.