Gave up on buying Spanish ebooks for before stories on El Corte Ingles / Tagus books - the experience is so bad they don’t even deserve a shame link. Luckily found ArgentinaBooks, which seems to have a similar library.
Even better, LibrosPatagonia in Chile has ebooks from the Ekaré editorial, so I’ll probably try it soon. Also in my list is MakeMake from Colombia, touting some sort of subscription with high quality books.
I’m buying these the horrible Adobe DRM, but using Calibre to set them free.