I want to use the Waltograph font on my business site. The font says free for personal use but what about on a webstore?

http://mickeyavenue.com/fonts/waltograph/
http://creativecommons.org/licenses/nc-sa/1.0/
no commercial use, sorry.

If a webstore is not a "commercial use", what's a commercial use ???

Contact the author to know his conditions for the usage of his font on your site.