Here's some of my purchases from the National:

Insulators: CD 162 Hemi. 19 orange amber (moderate damage, but displays good from one side) $15, CD 154 WT amethyst (factory mint) $20, CD 102 Diamond dk. amber $5, CD 259 Cable $25. Hidden behind those:U-318 Illinois green $10, Macomb white porcelan spool, CD 106 Madwell, CD 168 Armstrong, and CD 214 WT in clear 50 cents each. 6 miniature resin insulator models $6. Non insulator stuff: Mo-Pac picture $20, 3 padlocks (ATSF, UVY of O, RI signal) and Frisco calendar $40.