Trying to buy an Ikea pax: Some major but simple components I need to complete it are not available. I'd be happy to have everything delivered a month or two in

Trying to buy an Ikea pax: Some major but simple components I need to complete it are not available. I'd be happy to have everything delivered a month or two in the future, but no, I can't: Either I order now or I manually check back in the future. Why is everything so shit? Isn't getting me to buy their pax with as many interior elements as possible how they make money?