For 20-30ml you can probably (mis-)use a membrane pump meant for air or
low vacuum. These are available for instrumentation (eg CO analyzer,
pipette vacuum source etc) but not cheap. For absolutely cheap find an
aquarium pump that is suitable for rewinding and leakproofing and drive it
with a power oscillator (or PIC driving MOSFET). Another type of
relatively cheap pumps are the ones used for window washer liquid and fuel
in cars. The latter is immersed and may not like your non-corrosive
liquid. Both require huge amounts of current at 12V and will cause
problems if run off a small battery.

Peter

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