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You can easily build your own multi-channel dew controller, all the parts are available online or at Jaycar. The heart of it is a simple 12V PWM controller for each channel, which you can buy for about $6 on ebay. A plastic box, a few RCA sockets, some wire and there you go.
We used to have guy here on IIS that made them for other members (Arthur). You can probably find simple plans online.
I had a four channel controller that Arthur made me, cost about $35 from memory.
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