Since the local, really excellent sharpening service charges less than
US$20 on average to sharpen any of the 10" tablesaw blades I've taken
them,
I've tossed all the 'free sharpening coupons' where they belong. There's
a
lot to be said for dealing with someone across the counter, who's been
there for 25+ years.
Google a thread on Sharpening Service from some time in the last year.
Maybe there's a recommended shop near you.

Will be "looking nextime. I wondered, "What can go wrong..whats wrong with
free?"
(First off, "mailing" cost $ 12.00)
Now I know

R