1U servers with serial ports

I've got a stack of old desktop PC's running data collection apps in a
location we are going to rework. I thought I'd neaten up things by
replacing these with a nice rack and some 1U servers.

Problem is, looking at the Sun site, it does not appear that they offer a
fairly low end 1U unit with an RS-232 port. I need that for these data
collection machines.


Suggestions?

--
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
-- Benjamin Franklin
.