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If you are comfortable with it, I think assembling your own openmotes[1] is the cheapest option. The actual parts on there are relatively cheap and hand solderable if you are okay with CFN components. In addition, there are other cheap and relatively easy options available in the community if you are feeling more adventurous. [2]

[1] http://www.openmote.com/openmote-cc2538/ [2] https://github.com/dmarion/cc2538-dev

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