does anyone know of a web site where you can get a bunch of different types of submarine models that you can buy that are low cost ?

Tower Hobbies has a nice selection:

http://www.plastic-models.com/

There is also Stevens Hobby International:

http://www2.stevenshobby.com:5641/

You can also try Squadron:

http://www.squadron.com

Hope this helps.

P.S.: Best option is to get hold of a scale model magazine (like Finescale Modeler), they usually have a wide listing of model retailers and also local hobby shops where you can get some goodies.

thanks