Where to buy automotive body filler?

[KurumaOtaku]

Besides the "Bondo" brand that you can find practically anywhere,
where can one purchase auto body filler and resin? Part of the
work to be done would be on fiberglass and the rest would be steel.
Where do body shops get their fillers from? Also looking for sandpaper
in bulk since a lot of sanding will be required. Any help appreciated.

[corytomo]

Hmm, Redline has a lot of stuff. There was an autobody supply shop on Queen St somewhere... it's been so long since I've been in the industry that I dunno if they're still open.

[Zhanshi]

Rage gold or tiger/kitty hair (fibers + bondo) from Redline. Costs more than the average can of bondo, but more durable and easier to sand.