Well, it seems that the way to get a good price is simply shop around.
I asked Trade Paints for the price of Sandtex and it is £34 for 5 litres. Screwfix has the identical product for £36 for 10 litres. So I saved £100 there. I also saved £20 on 5 litres of Zinsser Exterior satin paint by looking online. Found a site selling it for £43 (free postage) when it is £63 on Amazon and everywhere else.
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