At where I work, they use a Ø127mm(5 inch) carbide saw blades 2 mm wide.
When one broke the other month, we got one from a place that usually stock them and told us that they are now an indent and special order.The company that makes the blades is no longer having that product in their catalog.
There is now a minimum buy of 10 blades, whether it is us or the company we get them from.And the price went up to nearly $800 a piece.
It seems if their is not sufficient demand those product lines are being dropped.