Today, we did the final bill of materials and this it was we ordered under our budget:

• USB cable male/male: for the instructions' book charger
• RB-TFT1.8 1,8'' screen: to display the messages and images on the M8B (what will answer to the questions asked)
• hall effect magnetic sensor: detects when the book is opened or closed to light it up automatically
• mini speaker: to make a little sound when the answer is charging in the M8B and potentially read it (we haven't decided yet whether or not to make it, or just if we make it mandatory because it could annoy some people)
• micro USB male to USB female: to wire the battery to the book
• micro SD card: one for the audio, one for the images (we alreay have one)
• audio amplificator module MP3 DF player: for the sound to be good enough to go through the speaker
• micro-SD module card ADA254: to connect the micro SD to the circuit

We mostly ordered our components on Mouser and Gotronic.