Wooden bookshelf, $10 each (or 2 for $15)

Adjustable. 5 shelves, roughly 5ft 8in high. Particleboard. This one is in fair condition; there are some scuffs on the sides and a chipped corner on the base. There is a similar but not matching bookshelf; you can buy them for $10 each, or 2 for $15.

Done