Complete hydroponic kits are available that range in price everywhere from a few dozen dollars to a few thousand.
At the lowest end of the scale some kits offer little more than someone could make for themselves by gathering common household items. But they do implicitly package a little knowledge needed to get started. By including seeds, a tray, some nutrient and maybe even some pH testing strips, they suggest what hydroponic setup is needed to get started. They may include a useful booklet, too.
The next level up usually costs a hundred dollars or so, but the materials are generally much higher quality. A tray that is specifically designed for hydroponics makes it easy to hold seeds in pre-drilled rockwool blocks that come with the kit. A small watering system might be included.
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