In the UK, the Maker Pi Pico is available from The Pi Hut (also as a version without the Pico pre-soldered, but with header sockets). Other distributors around the world can be found at the bottom of this page. The board is very well thought-out and contains a whole raft of features:
- Access to all Raspberry Pi Pico’s pins on two 20-way pin headers.
- LED indicators on all GPIO pins.
- 3x momentary push buttons
- 1x RGB “NeoPixel-like” LED
- 1x Piezo buzzer
- 1x 3.5mm stereo audio jack
- 1x microSD card slot
- 1x ESP-01 socket
- 6x Grove ports
Tony’s experiments are written in CircuitPython and cover using the GPIO pins, reading from the SD card, using a potentiometer on an analog input and using an SSD1306 display to show results from various inputs including a Pimoroni BME680 breakout board.
You can read the Instructable here and you can see one of his demo videos below: