If your sharpening interests include beauty shears and clippers, consider subscribing to
On The Edge newsletter by Jim O'Donnell http://www.otenewsletter.com
If your interest also includes saws, router blades, etc., check out the
Sharpeners Report monthly newsletter by Judy Brenner at Sharpeners-Report.com or email: email@example.com
Both newsletters advertise new and used equipment.