Malaysian trumpet snails can be found in large numbers in a number of drains and ponds. They are easy to find, and that was how I stocked my aquarium with snails when I was a teenager, but there is always the risk of introducing disease or parasites. But then again, I'm sure the common ramshorn and mystery snails sold at C328 are also caught from the wild.
An alternative is to scrutinise the planted tanks in the LFS to see if they have Malaysian trumpet snails amongst the plants or moss, and approach the shopkeepers to ask if you could harvest some. Haven't tried this tactic before, but I suppose some of them wouldn't mind having you play a part in reducing the numbers of 'pests' in their tanks.
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