What is a good communicaton device among teensy and arduino besides “XBees”

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Mattle
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What is a good communicaton device among teensy and arduino besides “XBees”
  1. I have been using XBees to communicate my teensies so far. However, as you know, XBees are really expensive and when I want multiple devices to communicate with each other, I have to pay for several teensies + several XBees, which come up to be more than 200 dollars.

    Also, An XBee is for between two designated teensies. I want all of my teensies to communicate with each other

    1. Is there any communication device out there that I can hook up to multiple teensies or arduinos at once without buy as much XBees?

    2. Or what is a communication device that lets everything within the range to communicate with each other?

    3. Or any other way to let them communicate without using individual teensies?

    4. How about the nRF24L01+.This transceiver IC operates in the 2.4GHz band and has many new features! Take all the coolness of the nRF2401+ and add some extra pipelines, buffers, and an auto-retransmit feature.

    If you can answer any of them, please help me out!!