I also have a PawKit. Found it on Craigslist for about $500, which was easily paid for considering that would be 15 fillings tested and travel time to the certification lab. Just keep checking, and use ONESCRAIG to do a larger search. Also, if you use Wybauw's book Fine Chocolates Gold, it has the Aw listed for many of his recipes. He also gets into the specifics of modifying recipes to lower the Aw. I've found that using his techniques as I tweek a recipe and then check with the PawKit makes me feel much more secure about offering my chocolates, especially my own recipes, to the public.