All Electronics sells a cabinet latch magnet at:
http://www.allelectronics.com/make-a...-MAGNET/1.html

that are 3 for a buck. They appear to be the same as the ones that Jeff mentioned (and Paul Johnson recommended in his Airfield models article) at <font color="#00265e">www.magnetsource.com/airfieldmodels/</font>

Also Ijust ran into welding magnets at Harbor Freight. They have a big one (4" or so) for about $4 or 5 but they also have some smaller ones in a 4 pack for about the same $5 range price. They are shaped like an arrow head so you can set them at several angles.

Magnetic building boards are great for my needs.