For a lot of international readers, Book Depository has been the best source for paper books that weren't prohibitively expensive. But it appears that shipping costs and competition have forced the retailer into closing April 26th 2023.
abi wrote: "Wow, I was not expecting this as they’re one of my go to retailers. Such a shame."
Amazon had bought them, so I guess this shouldn't be a surprise (same pattern - buy the competition and close it), but it's a pity since they shipped places AZ doesn't and at a lower cost.
You can still order until then.
Here are their FAQs
https://www.bookdepository.com/closure