I spent time yesterday researching blind hemmers after seeing the Nancy's Notions email. Huge price range and if you plan to do drapes, a portable model is not recommended. The commercial name is Reliable 700SB and Amazon carries it for the same price. I found the 700SB at a couple of sewing & vac stores but the kicker is a 20% restocking fee for returns while Nancy's takes anything back with no questions or fees. There are videos on YouTube on threading, oiling and needle replacement but I didn't find anything on blind stitching quilt bindings.
The major complaints about blind hemmers are there are no markings for tension and the threading path is a bit different from sewing machines as there is a small pin that must be used which most beginners miss. There is no bobbin thread and the stitch produced is a chain that can be easily pulled out if you tug on it. There is a mechanism under the feet dogs that push the fabric up as the curved needle takes a bite of the fabric.
Hopefully someone with a blind hemmer will chime in as I'm not fond of stitching on bindings.
Marilyn
Sequim, WA