I have this Marine Metal brand minnow bubbler but would like to find a different product as this one is just too loud. It does the job, and portability is nice since I have to transport minnows from the bait shop to home and such. But the noise is annoying.

I'd prefer to find something that can also run off rechargeable AA batteries since I always have a bunch of them and rarely have a backup set of the D-cells it uses. I switched it over to use AA's using a 4-cell AA holder but rechargeable AA's run at 1.2v and the little motor really wants the 1.5v the D-cells put out.