Does anyone think they could duplicate this board for less costs?
While the price on those is truly awesome, they may not fit everyone's needs the way they sit. There is a lot to be said for the custom approach for meeting a person's needs and it may be worth a penny or two.
This board below uses a shield PCB as the main PCB, it works well either way. This one is going to be a custom board and there are additional parts to add. But as you see it there, my cost is less than $9.00. These are the main parts from my favorite store:
I've also built up a few of these with female headers for friends getting into Ardunio (actually, I got them to build them. All part of the fun). With a regulator and female headers they work out to about $12.00 and are basically a full featured Arduino that can accept shields and all.