JAPANESE PERSON: How do you write "poster" in Japanese? & where online would I find to buy this poster?

Hello and thank you for reading.

How do you say poster in Japanese? (like a movie poster for your bedroom wall) . I would like the answer from a Japanese person because online translators have lots of errors in Japanese!

I’m looking for a specific Japanese poster of an old USA TV Show. Where online (in Japan) am I most likely to find it? (Sorry I won’t say which show because it’s rare) Yahoo auctions does not have it. I don’t know if it ever came out as poster in Japan but I believe it did from an image I found online in Japan.

Any help would be greatly appreciated. Thank you for your time.