where would you look ? im doing future planning so i could make one . i got the time . i dont know how you can have recirculating water and still keep the wate level under the net pot as you would in DWC . or does where you keep your res control the water level ? hope that makes senseHave you tried just making one. it would be way cheaper and i bet not that hard to make. If you want I can help you search for some that look interesting, easy and with materials that you can find almost anywhere