Here is a list of various USB to IR adapters.

http://www.usbuirt.com/

http://iguanaworks.net/

BF-120 http://www.bafo.com/menu-support.asp

search IRDA http://www.syba.com/index.php?controller=Product&action=Search
SD-U1IRDA-NM

http://us.startech.com/product/USB2IRX-USB-to-Fast-Infrared-FIR-IrDA-Adapter
onhop.ca $16.93, $12 shipping
cdw.ca $23.48, $13 shipping

http://cables.cablesunlimited.com/cables/Usb1510

Looking for reviews of any..