Relay or Opto I/O interface board

I'm look for a relay or better optoisolated I/O borad for connecting GPIO
pins.

Any suggestions?

Thanks.

http://bliterness.blogspot.com/2009/05/mini2440-relay-board.html

Thanks...
I'm just see it.
But I cannot made double face PCB on my own... 
I'm looking for a mounted prototype board.