I just received two of the elcheapo chinese mp3 trigger devices from ebay and they seem to work quite well!
I used a 5v phone charger to power it and loaded 9 sound bytes from the Charlie's Angels tv show onto it and connected a basic set of powered pc speakers.
I plan to use this in a mod for my Charlie's Angels pinball machine to add a bit more nostalgia to it. :)
Here is a video!
https://youtu.be/S_aTJjtqrlUCheers: Brettski... :)