I believe a couple people here have lamented that Kees Enkelaar hasn't been taking any new orders for his theremins in quite a long time.
FWIW...There is a HARDLY USED "Kees" theremin currently for sale on eBay. The item is located in California, and there is about 2 days and 20 hours to go at this time, and the price is currently $129.00 (USD).
Kees Theremin (http://cgi.ebay.com/Theremin-with-Volume-and-Pitch-Control_W0QQitemZ230024095069QQihZ013QQcategoryZ308QQrdZ1QQcmdZViewItem)
FWIW...There is a HARDLY USED "Kees" theremin currently for sale on eBay. The item is located in California, and there is about 2 days and 20 hours to go at this time, and the price is currently $129.00 (USD).
Kees Theremin (http://cgi.ebay.com/Theremin-with-Volume-and-Pitch-Control_W0QQitemZ230024095069QQihZ013QQcategoryZ308QQrdZ1QQcmdZViewItem)