I've been taking my occasional roll of slide film to Burlington Camera for 20 years & just picked up my stereo roll from the Hamilton meet. BTW, that was $14.50 for a 24.
Don't forget Downtown Camera on Queen for Toronto. Last I checked they were still doing E6 same day. And APUG advertiser Elevator Digital in Leaside will do a batch (6 rolls, I think) for $60 on demand anytime.