Keith
Check out Cairngorm I think they have Argyles for rent and they are located on Avenue road and Lawrence area.
You could also check out the Scottish Company they may be able to sort you out for an Argyle as well they are Located on Leslie between the 401 and York Mills.
I have dealt with both these companies and they are great people to deal with at both stores, we rented the Prince Charlies for my brothers wedding from Cairngorm and I bought my Isle of Skye from the Scottish Company, I would go back to either for anything.

I hope this helps.

I also know that Cairngorm is selling off their ex-rentals and have Argyles for sale.