Amazon.ca has a pkg of 10 for $23.99 carbide steel. Here is the link
https://www.amazon.ca/dp/B01HG0O4L2?psc=1
Precision Cutting Tools is the seller & there is a money back guarantee. I think I will place an order as it's worth trying them as they are only $2.40/blade. Even if they cut only half as much as Olfa or Clover it is still less expensive.