These big box shifters buy in bulk with tight profit margins and rely on a huge choice to befuddle most consumers into buying something. Quality is a statistical exercise and service just a revenue opportunity.
This time I was browsing and liked the look of a Microsoft ARC slim small keyboard At 1p under £50 it did seem a bit spendy. I got the last one and off I went. Doh ! when home I realized I had fallen for the old the last box is empty because that's the box for the demo item trick.
Worked out ok in the end as with the prospect of having to go back to the store anyway, I checked on Amazon and found same item in the marketplace. Available from stock and only £30. Back to the store for a refund.
So don't buy at PC World because
1) You won't really get what you want,
2) It will cost more than is available elsewhere.
An alternative and good computer tech store is Novatech. Helpful assistants and a good spread of economical to top end computer kit.