Reading a sensor directly on a PC.

Hello all,
Let's say that we have a plant where there's no PLC or HMI, and we have a temperature sensor with a 4-20mA transmitter.
If I want to read the 4-20 signal (or its equivalent in ºF) on a PC in real time, what could be the (cheap) options to do it?

Thank you!

Sensing modules which connect via USB are available

http://www.advantech.com/eautomation/remote-io/

http://www.hytekautomation.ca/U120816.aspx?productId=1

Heres another place.

http://www.mccdaq.com/serial-data-acquisition/CB-Series.aspx

Thank you!
What about something like this?:
http://www.omega.com/ppt/pptsc.asp?ref=PT-104A&ttID=PT-104A&Nav=

Has anyone used this kind of device?
Is the price OK or you know about something cheaper?