When buying indoor house plants, it is important to obtain them from a well-known nursery with a good reputation. Try to always go to the nursery yourself to choose the plants. The workers in a good nursery should have necessary certifications and education needed to answer all of your questions. Once you choose a plant you like, inspect it for damaged leaves, pests and signs that the plant might be sick.
Keep in mind that it is almost impossible to find organic plants in stores because it is very difficult to grow the plants and keep them healthy without using pesticides, fertilizers and other chemicals. You can also buy house plants online. This is a good option if you are looking for rare plants that you can't find in a local store. However, keep in mind that these plants almost always require complicated care. In addition, keep in mind that plants purchased online are often smaller and more expensive that the ones sold in local stores.
Be careful when buying plants in winter, as they can freeze if you don't get them to your house quickly. Discounted plants may be sick, so keep in mind that these may require extra care.