multiport serial boards?

[david at kramer.ne.mediaone.net (David Kramer)]

I need to get another serial port or two on my linux box.  I have one for
the mouse, another for my IR controller, and I would like at least one
more for an X10 ActiveHome controller.  Ideally I would have a fourth for
a dial-in modem.

If I get a normal add-on two-port serial card for ~$30-$40, could I use
that in addition to the two ports I have now, or are they going to
conflict with IRQ's?

Real 4-port serial cards seem to be very expensive.  Are there any that
are not?  I don't need fast.  Does each com port need an IRQ?  That would
suck.

Does anyone have experience with a particular make, model, or vendor?

Thanks in advance.

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