That is a super buy for the big blades. You really got a value deal!
:D
I don't use the 60mm blades but I ordered these two special sales:
Special $14.90 per 10 pack blades for 45mm and
28mm Special $1.09 per blade
I use the small blades for paper piecing.
http://jhittlesewing.funoverload.com/sewing/catalog.php