I think you can find something like this. http://www.eposperipherals.co.uk/melody-box-bixolon-rmb100/
More suggestions will come but for fun I’m copying @spanky’s nice DIY project from V2 forums here.
This guide will explain how to create a simple buzzer with little money.
First of all, buy a buzzer for intercom, available at any electronics store.
The model and the voltage does not matter, in my case I used one of
Ulmet the cost of 6 euros.
Obtain a telephone cable with 4-pin connector (make sure it has all poles connected to the cable)
Connect the den that corresponds to pin 2 partedno left the buzzer positive and the negative to pin 4 (see photos)
Place the beginning or end in the print pattern that interests us the following command<XCT> 27,112,48,100,200
The game is done
The command will only send a pulse to the gate of the money drawer which will sound the buzzer
You can increase or decrease the length of the sound playing with the last two numbers of the command, or you can add more commands to emmettere more sounds.
