Does anyone know where I can get some Hondabond HT?

I need it to seal my valve cover gasket properly but I’ve tried 3 local dealers and they’re all having difficulty getting hold of it. Chiswick Honda said they can get it for tomorrow but it’ll be £40 a tube!!! I can get it online for anywhere between £11-17 but I really wanted to get hold of some today so I can get my bike back on the road.

I’ve tried other silicone sealants but they’re crap as they just turn into boogers and fall off into the oil, which just results in a clogged oil screen and a damaged bike.