It all depends.
From YVR to YYZ, for a 60 x 20 x 45 cm (size of a small suitcase) package weighing 15 kg, and a declared value of $500 Fedex will charge you $97.69 for overnight delivery.
Go up to the checked baggage limit of 79 x 20 x 59 cm (max total 158 cm) weighing 32kgs, also $500 value, the price leaps to $181.38.
FedEx ground would only cost $27.66, but would require the best part of 5 days to deliver.
AC also have a 30/60 minute tender cargo services for packages up to 32 kgs. Tender them within 30 or 60 minutes at the airport, and they will be available within 30 or 60 minutes of wheel stop.
(YUL you have to tender at the cargo terminal--a pain. Retrieval at YYZ is 120 minutes on the Express60 service.)
If you have excess pieces, it is worth comparing prices with excess baggage charges.
[This message has been edited by AC*SE (edited 04-04-2001).]