DIY Solar Concentrator

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Parabolic Evacuated Tube

http://www.ffwdm.com/solar/solar-index.htm - $110 USD per kW of heat?

Ut this requires replacement of insides with a u- copper tube, which is a valiant effort. Tbis is because evacuated tubes have a closed heat exchanger mechanism - a closed copper tube with heat exchanger bulb.
Unless one can find low cost u-tube heat exchangers, the evacuated system appears to be too complicated compared to plain black tubes.

BOM

$25 per 6 foot evacuated Tube, no inner tube - water directly in glass? - [1] - affordable.

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