A quick search revealed this for North America:
http://bbs.keyhole.com/ubb/showflat.php?...true#Post166930
(searched for '+Sea +Level' )

But even better is the network link at this page:
http://bernhard.sterzbach.de/geflood.html
which you can set the height to what ever you want and it works anywhere in the world!
(searched for 'Height' in the Dynamic Data Layers Forum)