have an interesting question .How many times have you looked for parts for that armor model , that car or plane model or ship model and just couldn,t seem to find it ? The P.E. stuff can get expensive . Now here,s a thought , spurred by a flea market find .Try yard sales and make sure to check ANY loose jewelry offered for sale
That's "Gizmology 101"... More model detail-parts are found in "non-traditional modeling" locations than in a hobby shop and are usually free, or at least only a few pennies per part...
Old model model railroad layouts and broken trains, broken farm toys, other toys, electrical components, jewelery pieces, "hardware" drawers, bric-a-brac, this-n-that, etc...