Hi speedyink, I've been lingering around the forum for a few weeks now but this is my first post.
The price all depends where you look. If you check e-Bay, most Series I proof sets are going for between $50-$85 US, most local coin dealers are asking for $75-$100 CDN.
I was missing the COA from my Series I coins (actually, I had two Series VI COA's and no Series I COA) and I just picked up another set of the Series I coins in the box, with COA for $55.00 CDN at a flea market.....

Two of the capsules were in rough shape but the coins did not seem to be damaged, so I think I made out OK.