I'd like a stock of cheap notebooks, but at least in my country it's not always easy to find them with plain paper. Lined paper is only useful for children lear

I'd like a stock of cheap notebooks, but at least in my country it's not always easy to find them with plain paper. Lined paper is only useful for children learning to write from my pov. Online catalogues here don't always even specify the paper type - childrens' paper is just assumed.