Go here. He's even got some new stuff occasionally. With my bad memory it's like all new to me.
Far Side fans should also check out The Neighborhood cartoon series by Jerry Van Amerongen. His cartoons ran in a number of newspapers back in the 90s and 2000s and he has a number of compilation books out as well. Very funny stuff in a similar vein as Larson. I get huge laughs from both guys.
even old calendars are great...
it's in my daily funnies folder now