Which XBee hardware to purchase

I would like to be able to use Xbee for easier PID tuning. When I search for "XBee" on diydrones or Sparkfun, I get a lot of Xbee gadgets. Can anyone share some links to exactly which hardware I need to purchase, please?I think I need the 2.4 GHz version, as 900 MHz is used for cellphones here.

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