All prints retailers offer poster formats for those who want to adorn their walls with cheaper art.
Framed art prints can work out to be fairly expensive, once you have added up the costs of multiple mounts, a glass or perspective cover and a thick frame.
That's even before the shipping costs! Posters can be easily sent through the post and this lower cost means you could rotate between different posters in your rooms at different times.
Alternatively you could instead move artwork around the house to keep your rooms fresh and interesting.