One of the most commercially available monitor I can think of that fit you is probably the Storr's Monitor. Look it up. There are a few others that are similar in size or a bit bigger that are just as easy to get.
The problem is the definition of small. A Storr's I would consider as small, while Ackie is more on the smaller end of the mid-sized monitors. Either way, I bid you good luck. Check out Kingsnake and Varanus sometimes. They are good sites on monitors, and some of the world-famous monitor keepers post on them.
http://www.varanus.nl/ keep an eye on the site. Right now it is under construction, but some of the old pages can be found if you go through the archives if you can't wait.