Thermochill.
Heater core style radiators (radiators in general, I think) cost a LOT to make small quantities, as one must set up solder machine or what not. The tooling is usually a one time, very high cost thing, so that's the main cost for small quantities of these radiators. If you're making 100,000, let's say, like a car company, the tooling cost is relatively small per item, and the raw materials and actual work probably doesn't take long. I think. This is all inferred from what I've seen and heard and sounds about right.
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