BATSC sell them for
$75ea ($150 for the pair), but I guess that was where you got the price from.
So far I've ordered:
- board and PIC from far: ~$30
- crystal clock oscillator from mouser (I got a spare one): ~$24
When those two arrive I am going to start getting the rest from Jaycar/DSE. I've done a quick total for Jaycar/DSE and it should come to around $12.42 or so. Then encoders, PDA and mounting from where ever you can get them from.