IIRC, all lawyers in Ontario are Notaries. Other notaries are relatively few, and will still charge for the service.
Many law firms have some junior lawyer who will notarize something on a walk-in basis for an annoyance fee (i.e. a fee lower than the value of their time), maybe $20 or $40. Don't forget to have all your documents ready (i.e your own identification).
Usually, though, a notary can only notarize what they can vouch for: that it was you who signed the document, for example. A notary couldn't normally vouch for your academic transcript, although your institution should be able to provide a certified copy.