While scouring for a pump for my DIY overflow container I found that most of the koi fish pong stuff is on clearance at my local Lowes. Including a $20 750g pond filter with bioballs. Bioballs $10 12pack and various Fountain/waterfall pumps were also marked way down. They included a 3yr warrenties, which i assume may only get you your money back since they are seasonal/clearenced.