Ebay is the place to look, then. Expect to pay at least $10/inch for straightedges, 600 and up for a biax scraper. You can get new thin profile blades from Dapra, the last time I bought them they were $85 each (years ago), they also carry water soluble marking compound which is way easier to clean up than the oil based Prussian blue. I think Richard has some unmanchined castings for straightedges, also Gary Martin at Martin Model and Pattern has unmachined castings for straightedges and squares in various sizes.