Call up Humber Nurseries---(the biggest full service nursery in Canada)...they're in your neck of the woods. If they don't, they can put you in touch with who does. Or, call up Mason Hogue Nursery in Uxbridge--a bit east of you but good advice about soil testing.
Like Acton, its worth the drive to Guelph.
Do call first---they can give proper advice about how to go about bringing the required number of soil testing samples to the laboratory. Soil tests are not reliable unless taken from many far-apart places. Getting a test done for one particular area is useless.
