Ok, be very suspicious if somebody offers you a very good price on a tsunami buoy! This is a very good article on Padang, where tsunami warnings probably wouldn't do it any good anyway. The city has some serious problems, and a tsunami would come in very fast, right after the escape bridges have been destroyed. Probably the only hope would be the taller buildings, but how would they fare in an earthquake? And the available space is probably 1% of requirements.