$20 is a lot (I assume that’s the customer price buying them in volume). You have to save a lot of water / increase yield enough to justify that. That suggest

$20 is a lot (I assume that’s the customer price buying them in volume). You have to save a lot of water / increase yield enough to justify that. That suggests a BOM well under a buck, probably less than $0.50. I spent some time in this sector (at one company irrigation of almonds and stone fruit, another in wine) and the margins are very tight. Fortunately the farmers have sharp pencils.