SparkFun XBee Explorer Regulated - WRL-11373 - SparkFun Electronics
Xbee USB adapter
Serial Converter, Raspberry Pi to Zigbee, RS485, RS232, USB, TTL – Widgetlords Electronics
Amazon.com: DIGI JP5P2-9V11-6F Power Supply, 9V 1.1A Universal Power Supply w/US Plug (Requires Adapter kit Below);for use with XTend, XStream, XCite, and XBee PKGs & Interface Boards : Electronics
XBee click – board with XB24CZ7PIS-004 module from Digi International
DIGI ConnectPort X4 - XBee (ZigBee S2B) to Ethernet. Serial (RS-232), Security (5 VPN tunnels and encryption). Includes: US power supply, antennas. - Sapply