Perhaps Michael McDowell's best-known work is the six volume series collectively titled Blackwater. In 2014 it was made available in ebook format by the ghouls at Tough Times Publishing. They released the series in installments a month apart, just as it was originally released. How cool is that? All six volumes are available individually or in a single collection which includes an introduction by John Langan.
Head over to the Tough Times website to read more about the Blackwater series.