I shaved off so much money by just gathering some parts and building it myself. Building a PC is not hard or all that complex, it takes some reading up on the subject, but then you can do it for life. It saves so much money in my experience, built a dirt cheap PC two years a go and it still runs fairly well. Besides, if you know how to build one, you often also have much more of a clue when it comes to fixing one.
Alternatively you could also buy the parts yourself and then have a computer shop assemble it, I know there is a bunch of shops around here which do it for 50 euros. Leaving you to probably still save a lot of money from buying an entirely pre-built pc.