My only suggestion would be to make your own divider. That is what I and many other people here have done with great success. They cost less than $10 to make, and you can make a lot of them! I don't know where that pesky link went though... Maybe someone else can find and post it!
Remember that the tank your fish lives in is his or her's whole world. Ask yourself this question, and answer it honestly: would you choose to live there?