Higher costs of plants online

Due to the higher transportation expenses, plants which are available online are priced far higher than the offline prices. While goa is notorious for high priced plants (with the forest department plants the only exception), in most towns and cities the prices of plants are far more online . Most of the plants in Mumbai are available for Rs 40-50 each in 2017, while online the plant prices usually start at Rs 200 onwards.
Money plant or pothos is the cheapest plant offline , however most online retailers are selling the plant for at least Rs 230 indicating the highly inflated online prices.
The cheapest live plant online is aloe vera costing approximately Rs 118 per plant on ebay at present

Aquatic plants dying due to unknown reasons

Since vandalism by miscreants has become widespread in panaji, goa, as they enter the house with duplicate keys, the aquatic plants purchased online were kept in different locations so that a location specific problem would not destroy all the plants. It is found that the Salvinia minima are flourishing at one location in panaji, goa, while they are dying quickly at another location in the same city. In both cases, tap water is being used , however almost all the plants have died, while in another area, they are flourishing and new leaves are visible.
A similar problem is faced for Azolla caroliniana and Duckweed.
Any solution to the problem will be appreciated