I found a speech recognition module on this website: http://www.veear.eu/Products/EasyVR.aspx
It is cheaper and works very well (also for speaker independent words in italian). Based on the SENSORY RSC-4128 chip (http://www.sensoryinc.com/products/RSC-4x_series.html) this module is suitable for a wide range of applications (robotics, home-automation, consumer, etc...).
I only tested it with a PC connection (through an RS232 connection) and trained some words and sounds getting amazing results. In the near future I plan to start writing drivers for openpicus.