I am about to launch a website that allows the end user to get alerted as their bus approches the stop. The only problem was this is a little expensive as I'm paying about 5 cents per alert. I was thinking that if i added a short message something like "brought to you by acme co" at the end of the message I may be able to recoup cost without making my service a paid one.

Anyone know of any SMS ad companies or how one would go about finding one. Google has failed me, probably searching for the wrong thing.