Luthiers

The Sound Post
93 Greenville Street
Toronto, Ontario
Canada M5S 1B4
www.thesoundpost.com

George Heinl and Co
201 Church Street
Toronto, Ontario
Canada M5B 1Y7
www.georgeheinl.com

Ludi Pollak
Bow Rehairs
416-761-9901

Online

Cello-Strings.com
www.cello-strings.com
Free shipping and the ability to combine multiple sets.  All at a very good price.

Cellos2Go
www.cellos2go.com
A good source for accessories.  They have a large selection.

Shar Music
www.sharmusic.com
I do recommend checking out their selection of rosin.  I particularly like the leatherwood rosin.