I need help on 4 components:

BAT85 diode
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I know Digi-key or Newark sells them, but the minimum order is 25!
Does anyone know where I can get smaller orders of this diode, or
an equivalent replacement?

BC546B transistor
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Ditto for this transistor.

74HC239 chip
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Digi-key, Newark and Mouser do not appear to carry ths chip - does anyone
know what this does and where I can obtain it?

YM3623B chip
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This Yamaha chip decodes S/PDIF data (from CD or DAT). Where can I obtain
one of these?