Ebuyer seems to have stoppped supplying cheap computer power supplies, however Microdirect still do a range. This one is £10.50 including Vat. Standard ATX form factor, so should fit most pcs. Note that this appears to have a single euro socket on the rear. Reviews say this power supply is quiet and reliable. Dispatch within three days is £2.99, making the total £13.94. For those who do not know: Microdirect is not a new company, they've been in existence for 10 years or more.