Not sure what happened to my post last night, so here goes from memory:
It's $450 CDN at
https://www.jandm.com - they're based in Vancouver. Modern $20 gold bullion coins can be had for around $420, for comparison, so I guess it's not a bad price, although not an earth-shattering deal, either. Not all dealers have the set with the $20 gold coin, too, so it's not as easy to find.