Dave Barry
http://www.fantasticfiction.co.uk/b/dave-barry/
Patrick F McManus
http://www.fantasticfiction.co.uk/m/patrick-f-mcmanus/
Jen Lancaster
http://www.fantasticfiction.co.uk/l/jen-lancaster/
Fannie Flagg
http://www.fantasticfiction.co.uk/f/fannie-flagg/
If you have an account at your local library and they have an emedia section, you might be able to search by genre there
my library only recently started to feature ebooks, they have new sections like top 100 ebooks, etc; before it was mostly audio books being featured, (overdrives headquarters is nearby
but those work too, nothing like a funny book by Dave Barry being read by Arte Johnson or the late John Ritter... and on the advanced search you can always narrow your search result to whats available....
if you find an author you like you can use tools like:
Map of literature, Gnod's suggestions
http://www.gnooks.com/
Similar Authors
http://www.similarauthors.com/
to find similar authors