Quantity   Component name
1 × Raspberry Pi4 Model B $35 (2 GB or more RAM) https://www.raspberrypi.org/products/raspberry-pi-4-model-b/?resellerType=home
1 × Raspberry Pi4 case
1 × Class 10 microSD Card 16 GB $8 https://www.amazon.com/Sandisk-Ultra-Micro-UHS-I-Adapter/dp/B073K14CVB/ref=sr_1_3?dchild=1&keywords=class+10+micro+sd+card+16gb&qid=1606904845&sr=8-3
1 × USB-C 15W Power Supply $10 https://www.raspberrypi.org/products/type-c-power-supply/?resellerType=home
1 × Sixfab Raspberry Pi 3G/4G & LTE Base HAT $50 https://sixfab.com/product/raspberry-pi-base-hat-3g-4g-lte-minipcie-cards/
1 × Twilio Multi-Size Super SIM Card $3 https://www.twilio.com/console/wireless/orders/new
1 × Twilio Phone Number $1/month + usage fees https://www.twilio.com/console/phone-numbers/search
2 × goTenna Mesh radio $179 https://gotennamesh.com/products/mesh