While I was looking for a link to Sci-Fi Floors and Doors I came upon a great site for miniature doors. The site is Buchan Collectibles specifically this page and this page. So instead of just finding a link I spent about £120.00, which according to this site is roughly $200.00. Ouch, but well worth it to support my door habit.
Sci-Fi 1 ( Front and Back )
Sci-Fi 2 ( Front and Back )
Sci-Fi 3 ( Front )
Sci-Fi 3 ( Back )
Sci-Fi 4 ( Front )
Sci-Fi 4 ( Back )