Search:

No, that's not correct at all.
with a bit more, I'm talking about say a 40*150mm stone of good thickness.
Those can be had in the 60's or 70's.
And in Select grade too.

Well, 15 bucks ain't all that much:)
Then again, a 1mm layer isn't all that either.
If you want a Coticule, I would recommend spending a bit more for a decent sized and thicker stone.
Others will...