The latest sale is for the Prince of Tennis series from Takeshi Konomi, which Viz Media now has the original 42-volume series on sale via ComiXology, which can be viewed via Amazon Kindle as well.
A sequel manga series kicked off in 2009 as New Prince of Tennis, which Viz Media has not licensed, and has 18 volumes to its name so far.
The original run was serialized in Weekly Shonen jump between 1999 and 2008 and was adapted into a 178 episode anime TV series.