I don't think they were ever a dealer, but they may have ordered from a distributor somewhere, or purchased a catcher from one of the mower manufacturers we deal with. We are working on finding a solid distributor to partner with in Ontario. When we do, I will post it on the forum here as well as on the Website.
Dust covers are $59.00 for the regular and $69.00 for the XL. Part number is GCDust or GCDustXL. They come in four parts and are made of a fabric similar to that a cloth bagger is made out of.