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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
The iTracker is a neat bit of kit, and contains the processor running Espruino so while it's $88 you're not having to pay for a Puck as well.
You could try and get a BG96 module (which is what the RAK8212 uses) which has GPS/GSM, but those can be expensive too.
On the cheap end, you could look at the A9G - these are super cheap, for instance https://www.ebay.co.uk/sch/i.html?_nkw=a9g+gps+gprs&_sacat=0
However I'm not sure whether they come with an AT command firmware. You may have to make some tweaks to the existing SIM900 firmware to get it working as well.