> > =A0 - Unavailable or very expensive at high reverse voltage ratings.

> High as in 10s of volts or 100s of volts?..

You CAN get them rated at 1700 V !

10A+, 1700V

          http://www.cree.com/products/pdf/CPW3-1700S010.pdf

But, that's 'rather rare'.
$US20 - a bargain

1200V, 7.5A
Down to ~ $9 in 500 quantity
http://www.infineon.com/dgdl/IDH08S120_Rev1.0.pdf?folderId=3Ddb3a30431d8a6b=
3c011dbeca72db281a&fileId=3Ddb3a30431f848401011ff4dcd37d535a

6A, 600V ~ $2


200V. 1A
$0.30 / 3000
http://www.diodes.com/datasheets/ds30628.pdf

Compare that to a few cents or less for a 1N400x .


1N5818
30V, 1A
7 cents in 5000


     Russell

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