Painting a deck (about 1000 sq ft) so exterior grade emulsion with primer incorporated (don't know how they do that?). Also just re-sealed the driveway with around 36 gallons of, actually not sure what it is but it's black, smells like tar and takes a couple of days to cure. Much cheaper than paint though at around $160 for 36 gallons.
Generally paint here is around $40/gallon in the DIY stores and up to double that in the specialist paint suppliers. One I have used is shown in the picture below, might have got a good deal off them Brin for your Millmoor exploits

]