List of products by brand SparkFun
Here you find the Arduino Weather Shield, the Base Block for the Intel Edison Board, movable Arduino holders and more robot accessories from SparkFun
There are 165 products.
XBee technology is very popular. XBee is basically a point to point RF communication technology that is easy, cheap and with a low consumption. XBee is well adapted for embedded projects (Internet of Things, home automation) and robotics.