http://www.amazon.com/Frabill-Min-O-Life-Aerator/dp/B000F8U0HU
for those of you interested. bass pro shops has these aerators on for 9.97 in their new add. think i will run out there soon.
You should be able to get an aquarium pump less than that, and you won’t need to buy batteries.
got an aquarium pump at a garage sale free last year but haven’t used yet. never looked in to the actual price of a new one. thanks.