Onza just announced that they will be offering tubeless sealant, made with synthetic latex, hypoallergenic and free of ammonia. The compound has added microfibers to plug holes up to 6mm, according to Onza.
The sealing liquid is formulated not to dry inside the tire but only in case of punctures. It is compatible with CO2 canisters as well.
The sealant is available in the 250ml format for € 16.90 or in the liter format for € 33.90.