I came across some clearance items at Petsmart the other day and decided to go ahead and piece a system together. Total cost somewhere around 10 dollars. I made a holder from plexiglass to hold the water pump (free scrap material at Ace), a Repti Flo 250 mini terrarium pump (clearance item 5 dollars), then cut a piece of fluval 103/foam (clearance 99 cents, box of two) for a prefilter.