What sort of performance are you looking for? What capacity would you like? What form factor (i.e. desktop or laptop)?
If you're just looking for a barebones desktop drive, you can find some great refurbs at Newegg.
http://www.newegg.com/Product/Product.aspx?Item=N82E16822178430
http://www.newegg.com/Product/Product.aspx?Item=N82E16822145599
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148819
Those are a few options you may have, if this is the kind of drive you're after. Regardless of what you choose, I would highly recommend a refurbished drive at your price range if you are looking for something that's not puny or poor-performing.