There are thousands of excellent framed fine art posters that can be bought from any renowned artists that one considers to be great to even the obscure artists. Websites that concentrate on fine art posters are the best way to procure more than buying them in museum gift shops or from regular stores. More can be saved on websites because they have special promotions like free frames.
Never make the mistake of walling the posters without frames or you would have it looking so ragged. Luckily there are two alternatives buying of framed arts or framing them yourself but framed are more convenient. They save the time for hunting for frames which will match with the posters and taking strict dimensions to fit. Another thing you can do, if you are so prone, is have your fine art posters custom-framed. There are many framing houses that will embark on this job for you. But apparently this will cost considerably more. If you have the bucks to spare then you can go for the non-framed but if I were you I could go for the fine framed arts and save the miseries that come with the frameless and a few gees.