I have a bunch of used PCMCIA ethernet cards (10/100) with new dongles. They are $4 each plus shipping.
Contact me via this website to buy.
These are good for "fixing" broken ethernet ports on laptops. Typically, the little plastic tabs to hold the plug break, and the cable slips out. There are two ways to fix this. The easy way is to use a PCMCIA adapter.
A more messed up way to fix it is to krazy-glue or epoxy a short ethernet extension cable into the slot. You'll have a permanent piece of wire hanging out the computer.