I got my copy of Imagine when it came out. It's still in great shape. Played it once while a friend was over who commented 'I didn't know they released this on CD.' I still have the poster, but the postcard has gone away.
The Ono album is a stunner. The track Mind Train came on in rotation on my iPod while I was on the subway. I had to play it twice. It's like EDM prior to the genre even a gleam in some techie's garage. Awesome relentless beat. Have a listen.