That map shows the entire region. This one shows the actual COKL boundaries
The second & 3rd links are our local newspaper's site (they are part of a chain of local newspapers that are delivered free and entirely paid for by advertising). I know most of the places that are close to here or in Lindsay.
We are located near the western edge of the "city" so I often shop in towns in the northern half of the Regional Municipality of Durham (map) or even the eastern end of the Town of Georgina (map) (the job I just retired from was right on the Durham side of the Durham/Georgina border).
Anyway, I have ordered them from the marine supplier in Kingston. They had them in stock and I suspect any local marina I ordered them through would have to order them from a similar wholesaler and then mark the price up anyway. And the shipping was a lot less than ordering from outside of Ontario and I should have them in a few days.