Quite a few patterns online. Did you try googling?
Knittingpatterncentral has lots in their 'Women's Jacket and Coat' section:
http://www.knittingpatterncentral.co...ns_jackets.php
Don't forget to check the knitting books at your local library. There are some fab sweater coats in the Vogue books.
Also, keep in mind that you can alter a cardi you like to whatever length you want.
HTH,
cam