I've just discovered what I consider to be a rip-off by Sears, Canada. Their Craftsman mowers etc. tend to be relatively cheap, but when you need spare parts, as you ultimately do - WOW!
The same replacement mower belt for a particular lawn tractor is $41.99 (plus shipping) in the States and $100.99 (plus shipping) in Ontario! In other words, once they have you as a customer, they have you "over a barrel".
I believe that this should be publicised.