I would give $30 for a notes to be TPG by threee people. Split to $10 each way, I could present them with my UNC $25 bill from 1935, serial number 123456, and they could all arrive at a grade independently, then collaborate AFTER writing down an intial grade on paper. Then views could be debated, and flaws/perfections could be pointed out or highlighted in order to form a consensus.
I imagine my self coming to the Niagra Falls show with some juicy notes, and presenting them to a table of panelists, (at a table which might be open only for 2 hours) on the main floor where everyone else is. To get them Certified as GEM UNC 70 or 67 or whatever would be a great thing for my resale value (because that is the trend). Now, I obviously do not know how much time and equipment it takes to properly grade a note, but I always thought that a panel of three could easily look over a note and draw a conclusion in about 15 minutes. Add 30 seconds to print off a customized label from a computer program and put it on a specially designed holder, and you are done, right? (I know there has got to be alot more to it than that!)
Voila - a TPG note, done at a show, cost $30. (Remember this was all an idea in my head, without knowing the logistics of how it would really function).
The idea is, a walk-up table would create alot of attention (and alot of people would bring notes in my opinion.
I still don't have an ultimate solution.