The “new” RF hardware has arrived, ordered from China (Shenzen) online at http://www.aliexpress.com. After 14 days I got two pieces of this module, for about €15 (including shipping). You can see the TI CC1101 in the middle, the antenna and the oscillator. In contrast to the RFBee, this module does not have a uC or a serial interface. It just has the pure pins to control the CC1101: SI, SO (GDO1), SCLK1, CSn, GDO0 and GDO2 and of course the pins for power supply. The next step will be to get it working with the Raspberry Pi’s GPIO. Somehow need to get this fit onto a breadboard.