Also, are there different brands? I ordered mine from a place in North Carolina called Guaranteed Games. Also, what's the process of changing it? What else do I do besides unscrewing the NES and just switching the pin connector?

Did you really have to purchase it from somewhere all the way in Amsterdam? Anyway, so is there a specific way to change it besides removing the connector and putting the new one in? I'm assuming there's something to do with cleaning the connectors on the NES circuit board before putting it on, but how do I clean it?

You dont really need to do anything else.  What goes bad in the NES connector are the little 72 pins which you are replacing.  Not where it connects to the mainboard.  Although you can always clean that up as well.

Some people use this opportunity to disable the lockout chip at the same time, since they already have the system apart.

Edit- one more thing. You can buy connectors from www.estarland.com if you want.  I think its a lot cheaper if you buy a few though.

Al