Painting exterior porch floors

Part of my exterior deck is painted t&g flooring (covered) and the new attached part is uncovered planking - the t&g was painted in the past with oil-based porch enamel and has held up great - it needs a fresh coat and the new part will also get painted to match - however, they no longer sell oil-based porch paint in gallons in PA anymore - has anyone tried the latex-based porch enamels? I cant imagine they are anywhere near as good - other than buying lots of quarts of oil-based paints are there any better solutions - just concerned because I cant imagine the latex-based paints are tough enough...