Google ebay, they often have variants of C7 frogs and Nella C7 bayonets sometimes even located in the USA and the UK, and yes they can be imported into Canuckistan without any problems. Have the seller fill out the CN22 form as 'bayonet'.
EDIT:
Just did a ebay search for 'Canadian Bayonet' and there is a C7 bayonet c/w frog and scabbard now, and its only bid is $19.00, so be quick and start watching the item. Usual surplus price could be about $75 or so.
This bayonet is located in Ontario, so no importing is required, hell, I might even bid on it, ha!
Cheers,
Wes