Behr Waterproofing wood stain and Thompson's WaterSeal Deck & House are two highly-rated deck stains, according to ConsumerSearch.com. These stains range between $25 and $30, as of 2015, and both are resistant to dirt.
Behr Waterproofing wood stain, exclusive to The Home Depot, lasts for more than three years, and it resists color changes, cracking and mildew. However, some reviewers report peeling from this stain, but experts suggest applying a thin coat to avoid this.
Thompson's WaterSeal Deck & House also lasts for a few years, and it is resistant to color changes and cracking, but not mildew. This stain is available at most major retailers, and it comes in a number of colors including clear and semi-transparent.