Hi, I’ve also been on a bit of a trawl for expansions in the UK/Europe over the last couple of weeks. They’re getting scarce!
I managed to order a copy of Pyramids from https://www.spiritgames.co.uk a couple of days ago. Unfortunately they’re now showing as out of stock, but it’s a fairly basic website so might be worth emailing the owner and asking him to check stock.
Also looks like Amazon Germany may have an English language copy, says in stock here https://www.tabletopfinder.eu/en/boardgame/1638/eldritch-horror-under-the-pyramids but you’d need to translate the German at the actual Amazon page to be sure! https://www.amazon.de/product/dp/B013TRXWXM?tag=tabfin0b-21
Hope that helps and good luck with the search!