I can’t offer any suggestions for a specific “quiet” recorder. However, there are some methods for making a recorder quieter. They all affect the tone (and probably playability of some notes) to one degree or another, so it’s a trade off. If you run a web search for “recorder mute” you should be able to find some articles and videos about it. There are a few commercially available mutes, but you can also make your own from a piece of paper or cardboard that you fit into the hole by the labium. It blocks part of the air flow and reduces the volume.