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I would agree with steve here and add that liner done "correctly" is also expensive. Liner properly done has a concrete "retaining wall" structure behind it for much of the side structure and and it should extend below the frost line. All the drains, skimmers, mid-water drains and TPRs should also be anchored in concrete. The liner should just be the sealing layer. It's downfall is the short life expectancy(longer when protected and installed properly) and it's vulnerability to puncture and cracking over the long haul.
Here are some shots of ponds ready for liner.
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