No.1. ICStation 4X4X4 Light Cube Kit ICSK059A for Arduino UNO
Price: US$3.15~A$4.58
https://www.icstation.com/icstation-4x4x4-light-cube-arduino…
No.2. DIY Kit Metal Detector DC 3V-5V 60mm Non-contact Sensor Electronic Kits
Price: US$1.2~AU$1.75
https://www.icstation.com/metal-detector-60mm-contact-sensor…
No.3. PWM to Voltage Converter Module, 0%-100% to 0-10V for PLC MCU Digital to Analog Signal
Work Voltage:DC 12V-30V; (> 100MA)
PWM Receiver Frequency:1KHZ-3KHZ
Price: US$2.3~A$3.35
https://www.icstation.com/voltage-converter-module-adjustabl…
Free Airmail Shipping for Order Reached $20 usd (~A$29).
The 3d cube is “ok”.
Something like this would be way more awesome
http://hotchk155.blogspot.com/2012/09/making-pov-globe.html