Bread-Bakers v104.n027.5

The "lame" with extra blades sold by King Arthur Flour is fairly expensive:

<http://shop.bakerscatalogue.com/> then "shop by item number" for item 6378

The extra blades look much like old-fashioned double-edged Gillette or 
Schick blades which are available in a local Walmart store. Here in Canada 
they are $8CAN for a package of 10.

Has anyone looked for these and tried them?