Bus stop buttons

Hi,
I found this video where it seems someone have built their own bus stop button machine with sound.

https://www.youtube.com/watch?v=G5EGOqo01hw

Where can you buy used bus stop buttons in Japan and sound modules?

If I were to guess, these things may be sold when equipment "retires" from the company as commemorative pieces. I can imagine it is quite difficult to research on the internet without knowledge of Japanese. Those "in the know" would be dedicated clubs of fans of trains, buses, airplanes, depending on the pieces in question. I am sure the availability is quite scarce and they may fetch a high price at "auctions". This is my personal opinion and nothing is based on fact, but speculation. It is just what I think, based entirely on observation through the years. I am sorry I cannot be any more helpful, but I wanted to give my opinion that it may be very difficult to obtain. I hope you do find them!

Those buttons look pretty old. That makes me believe they were surplused when an old bus was decommissioned. Newer buttons have a more integrated design, and announce “stop requested” in Japanese instead of just a beep.

Here is a sample page from Yahoo Auction site for railroad related items:
https://auctions.yahoo.co.jp/category/list/廃品-放出品-鉄道-ホビー-カルチャー-オークション/2084007710/?p=廃品、放出品&tab_ex=commerce

You should purchase and modify this "toy" for children.
http://tokyu.com/shopdetail/000000001102/bus-goods/page1/order/
http://www.tokyu.com/shopdetail/000000001102/
https://youtu.be/8Vr-9DxYPSM

This product does not ship to out of Japan,
but it is the same module as the movie you found, "オージ社(KK-Oji)" module.
http://www.kk-oji.co.jp/memory/memory1.html

The video you found is DC-24V power supply that converted from AC-100V built in.
Used parts from scrapped cars are often sold at event sites such as "Bus Day".
https://anaba-na.com/20205.html

If you do not feel the feeling by pushing a button, many free apps are out.
https://itunes.apple.com/app/%E6%AC%A1-%E3%81%A8%E3%81%BE%E3%82%8A%E3%...