Ethernet cards can be had for just about any price you want to pay, probably an average price would be in the $15.00 to $25.00 range. I've seen them as low as $8.00 or so on the internet, but wonder how good they are.The hooker there is the labor to install, unless you know someone who can do it for you.
The USB ethernet adapter that MTU recommends is a brand called LINKSYS, and is available through Radio Shack(or internet sources) for around $39.95. It should be a matter of Plug And Play self install.
I have no personal knowledge regarding the USB adapter, as I already had networking cards in my pc's before this happened with MTU. If I didn't already have cards installed, then I think I'd opt for the USB route.
If in doubt, you might want to search the Kpro forums. I'm sure there must be someone there who has this device and would be glad to share their thoughts with you.
take care,
George
Here's a link to Radio Shack
http://r3.us.rmi.yahoo.com/rmi/http:...5Fid=25%2D3084