PC builders: Where do you buy your OSs from?

[Chalky10x]

I've ordered all of the parts for my first PC except Windows 7 because I don't know where to find a cheap but real copy. I'm guessing there are cheaper ones than £70 suggested by PCPartPicker, but I don't know which sites are trusted.

 

[Suztera]

£70 is probably a decent price for legit Windows OS.
The last time I bought a window licence was £73.29 on Amazon.
Just make sure you get it from a well-known retailer and check the reviews.

If you qualify for the Student Version on Microsoft webstore, that would be the cheapest price.