Take a gander at ebay - Search: Adult Baby Sissy.
Refine or define your search futher i.e. diapers (covers); panties; onesies;
so-on-and-so-forth etc.

There are quite a number of Canadian sellers in this catagory.
Be patient not all are selling everything all the time.
Just come back frequently and check.
Also remember to check the sellers other items.
And check if the seller has a store or website.
Final note to check the sellers 'Completed Listings' for things that did not
sell or might possibly be relisted if the seller is contacted.

swb2

AND thoroughly check the SissyKiss forum for "Items of interest" !