unless you are just after the plug and play aspect of the growing system you can make your own for thirty bucks each out of five gallon buckets, some net pots, a decent pump, some hydroton, and some bubble stones and tubing/fittings. that estimate isn't exact but for the price of one of those you could easily make two five gallon bubble buckets, or more if your pump can handle multiple buckets. not knocking the product they work just fine but you pay a lot for convenience on most of the RTU hydroponic setups
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