[V8] Finding GM Top Engine Cleaner in Canada

[radek at istar.ca]

Hello group.

It's time to take the beast out of hibernation and I want to do a proper carbon clean-up
job.  I called 
GM, Ford and Mazda dealerships in town and none of them sold such a product.  I looked up
part 
numbers on the Net, called again and was told that these numbers were US only.
Would anyone know how to get Top Engine Cleaner in Canada?  Suggestions for alternatives?
Thanks.

Radek
91 V8Q 5-sp
88
90Q