I recently ordered one from Logee's but I think the border guard was having an off day and it was confiscated at the border....said the paperwork was not in order. Otherwise Logee's will not ship outside of the US.
You could try Perry at Flora Exotica, he's in Montreal.
Flora Exotica - Exotic Fruit - Papaya
He has papaya listed but I am not sure what type he has.
Otherwise check out your local exotic plant societies - I picked up a beautiful 4ft babco papaya for $25 during their yearly spring sale