not only is miller paint (http://www.millerpaint.com/) a great place - nice, helpful staff, good prices, etc. but they are one of the places that carry devine paints - http://www.devinecolor.com/ . the devine line is incredible - pro painters love it because it often just needs one coat and it "goes on like yogurt". the colors are fabulous and you can buy small sample packets and try them out on a few walls to *really* see what the colors will look like. the devine paint is a bit more pricey than the average paint but the colors and quality are worth it.
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