if you look on Ebay you might find good deals on previous generation MacBooks... my friend said he got his for like 400 from Ebay. he hasn't had any issues with it since he brought it
There are many laptops available on wish.com/geek/m This site has been reliable to me for many purchases; however, I must warn you that I have not purchased a laptop from here.
The prices are extremely low, though, so it's certainly worth the risk.