FYI, when Tonina sp was firstly introduced into Singapore, the price was about RM 100 for each stalk (Yes!, it is stalk , not pot!), nowadays the price had been reduced to S$2 (RM4+) for each stalk. However, i must say the plant is really demanding if you can't create stable and low pH (5-6+)and kH (2-3)tank environment for them. Most people in Taiwan, Japan, HK, S'pore use ADA aquasoil (esp the ADA Amazonia aquasoil) to achieve low kH and pH water parameter.
ADA Amazonia Aquasoil S$48 for 9L