Good point carrellh, I've found that when it comes to nuts, bolts, screws & alot of smaller type parts than can be found at your local hardware store, they will be much cheaper than at any hobby shop. Example: a 1/4x28 'prop nut" may be $1.99 at the hobby shop, or 17 cents at the hardware store.

Mind you those are not actual numbers, just an example, but you get the idea! I allways check the hardware store first for little things, then if they don' have what I need, I go to the hobby shop.
Mark