TPGs for stamps?
I've got about half a dozen gem quality stamps that I'd like to grade. Some gem early mint airs, used E7, 311... They may well place in the 98-100 range. Most of my time and money is spent on the currency side; I have a membership in PCGS-C. Any advice on who to use and how to do it somewhat economically? (it probably doesn't make sense for me to buy a membership)