Done a quick stock check, seem to be around 50 in each store :)

Part of their Easter promo

Johnstone's Matt Emulsion is a high opacity, low odour, water based paint for use on interior walls and ceilings.
Colour: White
Size: 10L
Coverage (per litre): 13sq m
Coverage per tin: 130sq m
Effects and finish: Matt
Features: High opacity, non yellowing
Usage: Suitable for interior walls and ceilings
Number of coats recommended: 2
Drying time: Touch dry in 1-2 hours
Time to recoat: 2-4 hours
Interior exterior usage: Suitable for interior use
VOC level: Low
Coverage disclaimer: Coverage is dependent on the kind of surface being painted and should be used as a guide only.