I have a custom made dummy head with custom built mics. The design is really only a prototype and I am working on four other recording set-ups. All of the recording microphones I am working on should be rather cheap to produce and will be either holophonic or binaural. Once I settle on one that works the best and looks good, I'll make a few more to sell on ebay. 
The KU100 is actually considered inexpensive. I think the HEAD acoustics dummy head costs more than $15,000.00! Regardless, I love these types of recordings. Really puts you there. I'll be posting some more recordings later tonight.