Williams in my professional opinion is the top beauty supply in the city for a wide selection of color and supplies. They have the best prices and unlike Cosmetic World they all their lines in stock and the color itself is never old or already opened. Has happened! Good selection of higher end lines and middle road ones including Wella and Luxury.
The guys themselves are great and helpful and will order anything you need the same day. I ordered a blade once for one of my finnishers and it was there within hours!
Watch their open times tho as it is just Mon-Fri till 5. Close to subway and has street parking. A+