I have 7 inch auger blades, and did a used auger blade exchange by mail with Fish307.com and got them back in less than one week (I think they are actually out by Lake George or somewhere in that area).
I also saw a sign for auger blade exchange at a bait shop on 5 & 20 just south of Sturgeon Point (south of Buffalo). I can't remember the name of the place, but it has a little light house out front. If you want to know the name, let me know and I will call my Dad, as I think he knows the name.