More information at http://www.cosmicbooknews.com/top-10-comic-books-march-2016
I always find these lists to be interesting.
Marvel was the top earner by dollars, while DC was the top publisher. This makes sense considering the top book was the $10 issue of Spider-Man (which is really expensive). Honestly, I'm surprised it sold so well with that price tag. The issue was about twice the size of a typical comic, so the value is justified.
The top 10 comics list was dominated by DC, who secured 5 of the slots, Marvel getting 4 of them, and The Walking Dead by Image Comics being the sole contender not by the big two.
Interestingly, Image has the top two best selling graphic novels, Saga Volume 7 and The Walking Dead Vol 23.
Check out the link for more tidbits from March sales.