I convinced my son’s Scouting America Troop (formerly "Boy Scouts of America") to do a model rocket telemetry project. The goal is to find the SMALLEST form factor of little chips and sensors that we can mount to a cardboard-tube Estes model rocket.

• Arduino board (the brains)
• Cellular radio (so we can receive onboard data near-real-time before, during, and after the launch)
• GPS (so we can find it when the wind carries it away -- and also see how high it goes)
• 64g or higher accelerometer (I’ve read 32g accelerometers get pegged during launch)
• Battery mount (hopefully it can run on 1 or 2 button cells)

Optional sensors:

• ambient pressure
• ambient temperature
• ambient humidity
• ambient air quality

Waveshare has a combo ESP32, Cellular, GPS, Wi-Fi, and Camera unit for $48 (their website) $60 (Amazon)

Accelerometer:

• Sparkfun's highest accelerometer is limited to 64g for $22
• Adafruit's highest accelerometer goes to 200g for $25

Ambient Pressure, Temperature, Humidity, and Air Quality:

• Sparkfun has a breakout combining everything for $30
• Adafruit has a breakout combining everything for $20

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Archiving just in case I need a fallback:

LTE sensors:

• Adafruit has the Sony Spresense cellular daughter board for $99
  • But this requires also purchasing the Sony Spresence main board for $65
• Sparkfun has a Digi XBee Low Power LTE for $75 (yikes!)

GPS:

• Sparkfun has a GPS receiver for $20...but that means I need to dedicate RX and TX pins on the Ardiuno chip. They have a GPS breakout for $43.
• Adafruit has a GPS feather for $25