The RD-20 and the RD-30 will run you around $200 to $275 as of about 10 months ago when I inquired about them.
Also at that time I inquired about the 12VDC option for the MD series (something that at the time was very new and only had a press release). There is a minimum order (100 if I remember correctly). And pricing would depend on availability and price of the DC motor. But I was told in the range of $300 to $350.
Sort of burst that bubble as that takes it out of cost effectiveness.
But as I said that was almost a year ago. Things might have changed since then.
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