The cheapest I've found for the Sachs unit is on fleebay from Sachs themselves: here

That doesn't come with the slave cylinder though, but the Sachs one from ECP with 'parts25' discount (Briskoda discount doesn't work for this item) is under £30. Absolute bargain compared to the price ECP are charging for the same thing. :$$$:

The cheapest I've found for the Sachs unit is on fleebay from Sachs themselves: here

That doesn't come with the slave cylinder though, but the Sachs one from ECP with 'parts25' discount (Briskoda discount doesn't work for this item) is under £30. Absolute bargain compared to the price ECP are charging for the same thing. :$$$:

That company sachs-uk will supply a slave cylinder for £25.00