Amazon Paldean Fates

Anyone got any idea what the hell Amazon are doing with the price of paldean fates tech sticker?

Was gonna buy a few last week £15 next day delivery, even had it in my basket but forgot about it. Come back to check today and they removed it from my basket so I go find it again and see that they want a whopping £407 for the same tech stickers.

At both times they were sold and dispatched by Amazon themselves so it's not a random store jacking up the prices and to add to that the Fidough version is still £15.99 but March delivery??