Running Gear: replacement or compatible chest strap for Garmin 301

Hey All, I've been using a Reebok HR monitor for a while. It works awesome but my Mom gave me her Garmin 301 that she doesn't use anymore, however the chest strap is lost. I tried to make my Reebok sync up with the Garmin, but it was a no go. Does anybody know if there is any way to make these work together or perhaps know of a cheap replacement strap that's compatible?  Any help is appreciated. Thanks.