Ahh, it looks like Brampton is rapidly replacing the last of their 8-8-8s. I believe Toronto started mass changing them out in the late 2000s with the last three removed by early 2012.
One of the last 8-8-8s in Toronto, pic was taken in November 2011. It was replaced with a TCT poly in February 2012. Also remained fully incandescent for almost two years after the last incandescent signals in Toronto were retrofitted.
York Region seemed to be the first to replace the 8-8-8s though, I believe by the mid-2000s they were all gone.
This is the only pic I took of a 8-8-8 in Markham. It's a video still from a video shot in spring 2004 or so. By 2006-2007 all the signals at this intersection would be replaced with 12-8-8 Eagle Durasigs (still hanger mounted though). Unfortunately my camera at the time took horrible pictures and videos.
Mississauga still has some 8-8-8s left though.
A pair of Fortran 8-8-8s Oddly they're new enough to be plastic, and plumbizer mounted. Another odd thing is the 8-8-8 on the right hand pole. Normally a 12-8-8 is used.
Ancient CGE 8-8-8 It's probably from either the 50s or 60s as it still has the first gen CGE back. Newer CGE 8-8-8 on the opposite side of the intersection.
Dixie near Dundas I believe this one dates to either the 70s or the 80s...