share a mobile broadband Internet connection?

SO FAR IN MY SEARCH I HAVE FOUND A BROADBAND ROUTER LINKSYS WRT54G3G-ST 0R -AT THAT WILL
TAKE A PC CARD FOR WIRELESS ROUTING.
THIS ELIMINATES THE NEED FOR CABLE IN THE HOME
OR WORKPLACE.
THE PROBLEM IS THAT I CAN FIND NO OTHERS?
ANYBODY HEARD OR SEEN ANOTHER ROUTER OR ANOTHER
WAY TO SHARE YOUR PC CARD?