First of all, I love you!
Being a Ben Ten fan on a grand scale myself, it's nice to see another person who appreciates the series! lol, I'm so lame but honestly I couldn't care less, Ben Ten is uber awesome! :D
I don't know about online, but the comic books are produced by D.C. comics for the C.N. You can buy a subscription online from dc-universe. It's less than $20.00 for 12 issues. The only bad thing (?) is they don't always have a Ben Ten story in every issue. You can also get them off e-bay sometimes.
At the moment, authentic comics regarding Ben ten are very limited and unfortunately somewhat uncommon. Still, keep an eye out as you never know what might show up!