I ordered an ESP32 module from Ebay:

http://www.ebay.co.uk/itm/WeMos-D1-Mini-Mini-Pro-Compatible-Shields-Now-with-Triple-Base-and-ESP32-/322729576423?var=&hash=item4b242e87e7:m:mTDnl7ewzGuk9vFvBSGmXCA

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