Can you buy photos from NASA?

Inquiring minds want to know: Is it possible for individuals or entities to purchase photographs originating from NASA's vast collection of space exploration imagery? I'm particularly curious about the legality and procedure involved in acquiring such images, as NASA's work is often groundbreaking and captivating. Additionally, I'm wondering if there are any restrictions or limitations in place regarding the usage of these photos once purchased. Clarifying these points would be invaluable for those seeking to obtain and utilize NASA's remarkable photographic archive.