35mmc, the blog about compact 35mm cameras, has a guest article by Parallax Photographic on the Tetenal C-41 chemistry kit. This kit is available in 1L and 2.5L sizes. The 1L kit can process up to 12 to 16 rolls of 35mm film, depending on a number of factors.
Tetenal kits are available from Parallax in the UK, in the US both Amazon and B&H sell C-41 kits in powder form, in Canada, buyfilm.ca sells the 1L and 2.5L kits in powder form and in Germany, MacoDirect.de sells the liquid chemistry kits.
Lomography has an earlier article on the E-6 kit, which seems harder to get.
