Did anyone order the Olfa blades on Massdrop?

[DramaMama]

They are offering (for next 12 hours):

TWO 5 packs of rotary blades for $31.99; and you can mix/match 28 mm, 45 mm, 60 mm.

Question: for the 60 mm you have to add $11.

Do you add that for EACH set of 60 mm you buy or is that only when buying both sets in 60 mm?

Is it, then, less than $11 add on if purchasing a set of 45 mm and a set of 60 mm?

Have an email into Massdrop, but thought I'd ask here in case I didn't hear from them in time.

Thanks!

[Iris Girl]

I go to harbor freight and buy the 45 mm round blades they sell for rug cutters. You get 2 in a pack for $1.99!!! They work great in my Olfa cutters and I never feel bad when I need to replace them. I also find they last just as long as the Olfa blades. Except now I change more often