FOSS gamedev and creative worlds

I need a new pc, and I was wondering if you guys know any cheap pc websites. I am aware of dinopc.com, and pcspecialist.com as well. I need an upgrade because my computer lags even playing minetest. Any good ideas? I would prefer (doesn't matter in the long run I guess) if it is a UK or Europe based pc shop. Thanks a lot

Try Gumtree.com or Ebay.co.uk
Theres lots of cheap pc's on ebay which some will deliver to you.
Any other auction sites in the UK are probrably good.
see how you go.