As a professional builder I have to have very sharp tools all the time. I change #11 blades many times each day. Sometimes I only get a few cuts from a blade and then have to discard it because it has lost its edge, or has a broken tip. The blades on the market today are not the quality of the blades we used to be able to buy…
Having said that, I have found one source for very decent #11 blades in 100 count boxes. I buy mine from Micro Fasteners
http://www.microfasteners.com/They were out of stock recently when I needed blades, so I went to the local hobby shop and purchased a box of 100 Excell blades. They were just awful! Very dull. I cannot tell you that this is normal for Excell, but I won’t purchase any more of their blades. This may be an anomaly for Excell, as others who have posted here have reported that they were very satisfied with them. But for me it's "once burned, twice shy."
I also use a
lot of #11 surgical blades and I buy them in boxes of 1,000 blades at a time from a company called Pincover.
https://www.pincoverindustrial.comThey are not cheap, but they are the very best surgical blades I’ve ever used. Perhaps a club could purchase a box of 1,000 blades, divide them among the members, and share the cost.
As less and less people build models, the good building tools are becoming progressively harder to find. A few years ago the Solingen company discontinued their razor plane, and in my opinion it was the only small hobby plane worth owning. I found a cache of them and bought them all so that I'd never be caught short. The real secret to the Solingen plane was their blades. They were just the best, and they are also not available anymore.
Stay sharp - Bob Hunt