Athlon sockets - where to buy?

Does anyone know where I can buy a 462-pin ZIF socket for the Athlon, like the Amp #916788-x? I don't need one now, but I'm worried about the tabs for the heatsink clip breaking off, and the tidiest fix I can think of for that is plugging another socket into the existing socket. It also may be possible to switch from a clip-on to screw-on heatsink this way.

I'm pretty sure that the extra lead length won't be a problem because I'm currently using a Pentium4 with a 423-to-478 adapter socket.