When I was there he had at least a dozen-20 left. The store is at 385 Dundas in Cambridge, Tri City Office Furniture. The entrance is around back a ways.
I hate the way Kijiji's links go dead after a while. This one should work for a bit:
2 Office Chair for $30!!! BIG Chair SALE!!!! - Kitchener / Waterloo Furniture For Sale - Kijiji Kitchener / Waterloo Canada.
Just in case, here are the details:
519-267-3648
Tri-City Office Furniture
385 Dundas Street North Cambridge ON
Office Furniture New & Used Cambridge Ontario - Kitchener-Waterloo Guelph Brandford