I don't think the actual switches are available but I found this:
Blackberry Bold 9000 OEM Midplate
It's described as a used part but it has everything on it (all switches, speaker, etc.) and they are a USA vendor so you don't have to wait 2 - 3 weeks for delivery. All you need is a T-5 screwdriver for the 6 screws hold in the midplate, it just pops off. Good luck!
