I found a Castle 1520 Motor on eBay but it only ships to the US. I did find a newer alternative to the Castle 1520, the LRP Dynamic 8 1600kv motor, pretty hard to find but they released it in late 2012 so its still relatively new. Here are some links, first one for the motor alone and the second one for the 1600kv motor & esc combo.
http://www.lrp.cc/en/products/electr...600kv/details/
http://www.lrp.cc/index.php?id=804&n...&prd=31680&L=1
I had a hard time looking through the LRP shop to see if they had any in stock, it kept putting the language in German. I am using my iPhone.