Photographers' Formulary however they will not ship it outside of the US. The Moersch toner is the only toner that I can be sure is a polysulfide toner. There are a couple of other toners available. Silverprint stock a Fomatoner Sepia which is described as a sulphide based toner however when you look at the safty data sheet on the website the active ingredient appears to be thiourea. Tetenal have a sulphide toner however I cannot find any further information on the Tetenal website and suspect that this is a sodium sulphide rather than polysulphide based toner.