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Piezo Buzzer Throwies which buzz every 15-30 minutes and should last months.
kicad/)arduino/)1-1.50€/Piece
depending on what deals you get on the components.
For big orders aliexpress.com might be one of the cheaper options
We used seeedstudio.com, but dirtypcbs.com is also a cheap alternative. Maybe even buy a solder stencil to make your life easier!
Use the included arduino code to flash the ATTiny25 using a POMONA Clip or other means of electrical contact and an AVR programmer.
Solder the SMD and normal compontents onto the board.
Place the battery in the battery holder (duh) and listen to them beep!
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