Just once in a while .............
Whenever I want some components (never systems) I check PCWorld online, and everyso often they have a bargain - perhaps mainly because I don't need cutting edge - usually in optical or hard drives.
So I order it, go in, pick it up from the rack near the door, go to the display and change it for what I actually ordered, go and pay.
And if the checkout jockey suggests I need a £20 3 year warranty for the £15 item I have just bought, I just say "thanks, but I'm not that dim".
Of course their Tech Guys are always good for a laugh if they've got a customer;
"My computers running slow!"
" Well you need a bigger hard disk and more memory"
Unfortunately the majority of the population have no idea what they are doing with a computer beyond using it - and that goes for a lot of the kids as well.