You can get Honda gasket kits, bowl gasket, cap gasket, orings. But Honda does not sell complete kits. If you want the best though, you can still order most of the parts a la carte. However, each part costs a lot.
For EACH carb you will need (Gasket set ~$15, main jet ~$5, slow jet ~5, needle set ~$20, float valve set ~$20)
Keep in mind that doesn't include, new dust caps, and new air screws which are going to be harder to find. The above stuff you can still order though.