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Well, you could always buy an Aero garden. You get everything you need in one package. You can't grow much and they are pricey but it gives you an idea of what hydroponics is all about.

Unless you have a dedicated greenhouse or do it outside the expense is much more than a traditional planter. You need lighting arrays and a bunch of other hardware for indoor applications.

There are outfits that sell kits for starting your own hydroponics. Some are quite large and some very small.