You need one of each of the following parts per noisemaker
490-4698-ND - Piezo buzzer
ATTINY45-20PU-ND - ATTiny45 DIP-8
Mouser has the ATTiny45 for significantly cheaper - $66/100 instead of $108/100. Mouser PN: 556-ATTINY45-20PU
952-1735-1-ND - Battery holder
P189-ND - CR2032 battery
PDV-P8103-ND - Photocell
RNF18FTD10K0CT-ND - 10k resistor, through hole
3x JW60ZT0R00CT-ND - 0ohm resistor, through hole
AE10046-ND - DIP socket
AE10046-ND - cheaper, untrialed DIP socket
Each noisemaker will also require:
2x M2 screws, long enough to reach through your board material (I used 3/8" screws for 1/8" acrylic)
Available from Digikey in multiples of 100 - H739-ND
2x M2 nuts
Available from Digikey in multiples of 100 - H761-ND
I used 1/8 inch acrylic for the boards. Any reasonably stiff material will work (I'd like to see an implementation cut from card stock and 'drilled' with a hole punch). I found that transparent colors of acrylic work much better than opaque - being able to see the board art from both sides is very useful.