Sorry I didn't answer your question about hypalon glue price
If I remember correctly, it's about double. Again, go to a liferaft
repacking shop, or a local inflatable dealer. Pick their brains and they'll give you a better package deal. You'll learn a lot (if they're good people willing to help). If your boat is hypalon (Zodiac used both PVC and hypalon back in the 90's I think), and you have used PVC glue, ya gotta take it off and redo. Hypalon glue is 2 part and takes more practice to make it pretty. You will need some tolulene* (spelling not gaurenteed) to clean the needed repair spots with.
I'll stop there and ask, where are you? If you're in my old haunt, (LA Harbor area) I can recommend good folks that wil help you keep the price
down. I'm in Saudi Arabia, until I die or next month, whichever come first.
* Toluene is also known as methylbenzene or phenylmethane