The Colonial Acres site is a good one for checking current values - I think their prices are fair and reflect current supply/demand of modern Canadian coinage. I've bought from them at least once a year and they have excellent shipping and service and decent grading on raw coins. Make sure you know exactly what kind of proof set you have. Unlike US sets, which are just proof or silver proof, Canadian sets include "specimen sets" and "proof sets" as well as many different special issue sets, not to mention the different uncirculated sets, which you were not referring to in your post.
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DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
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Or this company
DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don