Just came from Harbor Freight and found many items useable for modelling. My most exiting find was a set of 5 circular saw blades in 1" to 1 3/4" diameter with a mandrel for $4.99. Try them for all kinds of tools and parts cheap enough to use in ways not intended by the manufacturer. Note: the tool quality may not be good enough for actual precision work like miniature screwdrivers and the like, but somethings are OK. Try them at Harborfreightusa.com
Paul