Epps has (had) a few Soper's when I was last up there.
There was a couple brothers and either an uncle or nephew, plus one of the son's - all Sopers that built firearms, primarily in London Ontario (then called Western Canada), with the uncle or nephew possibly working out of the Burlington Ontario area, back during the late percussion era.
Anyhow, Epps definitely had one of Philo's guns and a couple by William. They were a couple percussion "rifled" and one shotgun - all just over the 1K mark on the pricetag. None were pristine or even excellent, but they did at least look fair and functional.
If you are really after one you may want to contact Epps if you can't find the one out your way.