i set uk when i made the account, im in romania actuallyI can buy them at every corner dollar store, gas station, and pharmacy here in the US. I'm fairly certain that you can find them in the UK. Wherever they sell gift cards they sell eShop cards. They're right there with the iTunes, Play Store, Steam, XBL Gold, PSN, and Amazon cards.
I'm starting to think that people just like making excuses instead of admitting that they ignorantly updated. ¬_¬
and yes, i admit i ignorantly updated before wanting to homebrew