You may find them at Walthers or Kadee. I've got just slightly larger screws from both.
Kerry
Where is the best place to buy 2-56 screws 1/8 inch long? E-bay and others really take advantage of modelers if one buys packaged screws from athearn... I need these for my athearn BB cars to hold the coupler covers in place. Will 1/8" always be the correct length or should I also purchase longer screws as well?