INTEX Rectangular Frame 9 ft 10 in x 6 ft 6.75 in x 29.5 in Above Ground Pool, Swimming Pool with Steel Frame, Pump Not Included

This is one of the pools I use for growing koi. Net the top because it's not much better depth wise. It's less than $100. They need to be kept out of the heat or use shade cloth. If the pond isn't done by winter, Styrofoam sheets can be fit around the sides for winter. Solar pool cover over 3/4 the top. https://a.co/d/06IPWjjJ