Recently when looking online for the Echo Mountain O Scale saw blade set
which is now unavailable since the owner passed away a few years ago
I found another source on Ebay.
These HO and O Scale circular saw blades measure 72" in diameter.
They are made out of .011" thick acrylic and are silver in color.
I purchased a set in HO and O scale,
the O scale for the main saws and the HO blades for the cutoff saws. The blades are much better looking than the photos shown on EBay.
The shipping was free and I received them within a few days.
The company also offers some finished scale lumber piles too. Here is a link to the website on Ebay: