Hi Anne
I think the cost of shipping these things is prohibitive, as you've suggested. You might try donating them to a local stamp club, if there's one near you. Or even try some local estate auction houses. I got my 2003 set of Scott's at one. No good for pricing, but I can still identify items.
The really old ones, 1915, would be of interest to some collectors just for their historical value.
Where in Ontario are you located?Never mind, I see you are in London.
John Sheffield Philatelist Ltd is located there. He runs some pretty high end auctions. You might try approaching him and see if there's any interest.
http://www.johnsheffield.comGood luck.