freestyle6883,
Once you find a source for these nuts you may want to pick up some extras and keep them in your flight box. One of Murphy's Laws says that an nut dropped on the ground will immediately roll/bounce someplace that is difficult to see, and impossible to retrieve!!! Having spares can save a flying day at the field if it happens to come off at the field. While rare I have seen prop nuts come off in flight and the spinner, prop, and nut came off and fell off the plane. Pretty much next to impossible to ever find again. So always have spare nuts and props (you can fly without a spinner). Now before you get paranoid about losing it in flight let me say that it's almost always a 4-stroke that throws the prop off, 2-strokes rarely do it.

Hope this helps

Ken