One of the best prices I have seen for a ready to go dynohub wheel is from Anthony at
LongLeaf Bicycles. He will do you a
complete wheel out the door for $112 +$15 for shipping, that is his lowest priced wheel. Changing the number of spokes, type of spokes or rim will add to the price, but it is still very reasonable. He builds quality wheels and is a great guy to deal with. I build my own wheels, but still buy parts from him, mainly lights, rims and saddles.
Aaron