What is the cheapest IR receiver I can use with MCE 2005?

I'm looking for a very, very cheap IR receiver to control MCE 2005 and perhaps MythTV/SageTV in case I ever decide to try them.

Do almost all IR receivers work with MCE 2005?

What is the cheapest one that will work?

I have a JP1 programmable remote, so I shouldn't need to buy a remote control. I only need the USB IR receiver...