I'm not aware of any VoIP providers that have DIDs available that are local to Cobourg. The best thing I could think of doing if you really need a local number there, would be to get a toll-free number from a VoIP provider, then people could call you for free .. don't know what else to suggest.
I should have mentioned that I do have a toll-free VOIP number through Les.net. But I find people are reluctant to use it--particularly non-business callers. Not sure why.