Just thought I would throw this out there for people in the UK. If you are looking to buy some new PC parts or whatever you can use a thing called Bespoke offers. It is from Barclays and operates essentially like Flubit if you know what that is apart from a lot quicker. For example I found an MSI R9 390 for £260 odd then I put it into Bespoke offers and got it for £237. It arrived the next day and I am currently using it in this PC as I type this.
Essentially they give you exclusive prices on items that are usually quite a bit cheaper, sourced from their own merchants.
At the moment Quidco is doing a special 18% cashback on bespoke purchases so you stand to save quite a bit of cash. I bought a Phanteks heatsink the other day for essentially £47 whereas usually it is £70+.
Not all retailers are supported but some big ones are, Amazon for example and for more PC related stuff you can use eBuyer or Novatech.
Links for your own exploration:
Bespoke offers
Quidco cashback
It is worth noting though, whilst I haven't had problems with any items I have ordered (so far), it is possible you may get the wrong item or something, in this case before buying anything make sure to read how returns work before parting with your cash. Obviously that sort of warning may put many off but it seems to work rather well.