RS-232 buffer/splitter

Hi,

I am looking for a simple circuit to use for rs232 serial data. I am using one talker device (GPS) to communicate NMEA data to 4 listener devices, but my GPS can only handle 2 devices. More than that loads the circuit down. I am too poor to spend $300 US to buy one. I hope someone can help.
Thanks,
Ken B.

use a adm208. you can get it at digikey.com it's about $2.50