Reddit reviews Adeept Ultrasonic Distance Sensor Starter kit for Raspberry Pi 3, 2 Model B/B+, LCD1602, Motor, C and Python Code, Beginner/Starter Kit for Raspberry Pi with User Manual/Guidebook

For Octopi (Pi running Octoprint), I bought a stock Pi 2 B+ and an 8GB micro SD card. Scavenged a microUSB charger from a deserted phone (anything as long as it's a 2.5A power supply). I had an SD card reader already, and a random microUSB-USB cable.

If you're going to run Octopi, you might already have access to a 3D printer to print your own case. You might consider a $5 USB webcam from a thrift store.

GPIO layout is easy enough to find on the internet - the amazon kit doesn't actually give you anything actionable for using the pins. (If you're looking for a kit to mess around with a Pi, find something with a bread board, any kind of sensors, and a mix of male-male, male-female connectors to go from your pi to bread board, breadboard to breadboard.) Something like this, if you go barebones on the Pi. (Once you have your Pi running Octoprint, you can still use the electronics kit with another pi or arduino.)

The kit also gives you heat sinks, which is...okay. However, they don't give you any thermal paste to attach them — I might not be understanding how these heat sinks attach.