Price Discrimination?

I read an article in the Sydney Morning Herald a few years ago.  It basically said some online retailers were trying to charge different amounts for the same item depending on where you live.  The theory was the suburb you live in dictates how much money you earn which in turn dictates how much you should pay for goods.  (On a side note, if they are going to discriminate against where people live, can we talk about discriminating against size??  My size 5 feet and size I-J fingers require much less leather/gold than bigger sizes yet I pay the same price.  I'm not saying we should start discriminating based on the size of an item but isn't discriminating against a consumer's postal code the same theory??).  Anyway I found it absurd at the time and thought nothing of it again.  Until today.

I was browsing the Louboutin sale on the Outnet on my phone last night (don't bother - not worth it).  Then today I thought I'd have another look just in case they added more stock (wishful thinking, right?).  I saw a pair of flats for £217 which I could swear I had seen for £250 the night before.  Clearly I've lost my mind and the lack of sleep is getting to me.  Then tonight upon coming home to an empty apartment and wanting some retail therapy after an obscene day I decided to have ANOTHER look at the Outnet (obsessive!).  Aaaand guess what - they were suddenly £250 again!

Not believing my eyes, I sent my sister the URL for the flats and asked her what price they were.  £217 she says.  Send me a screenshot I tell her.  So here you go, my sister can buy these flats for £217 but I have to pay £250 for them.

Have you experienced this before?  Have I been paying more for months?  Years??!