I have been on a search for Bostik 2402 Hypalon adhesive for a really long time. I had found zero US suppliers, for some odd reason (I assume it's the whole hazardous shipping thing, coupled with a fair availability of alternates such as Clifton, Shore, etc.)
Anyway, I found someone who *sometimes* has it in stock:
Clavey River Equipment imports some each year.
So, if you're looking for the stuff in the US, you might try there (Canadian ribbers might also try Polaris Inflatables; I think Guy said he uses it and sells repair kit-sized cans. No idea where he gets it from.)