Newbee question: Arduino Mega - UARTS

I have a newbee question

How can I connect my PC to the uarts 2-4 of the Arduino Mega, whicht type of cable do I neeed?

And where can I buy it?

Thanks a lot!

First are you planning to use USB or COM ports on your PC?

If using USB you will need something like this for each serial link:

http://www.sparkfun.com/commerce/product_info.php?products_id=9115 plus an approprate USB cable like this:
SparkFun USB Mini-B Cable - 6 Foot - CAB-11301 - SparkFun Electronics

If using COM ports then you will need something like the for eack link:

and a cable like this: Serial Cable DB9 M/F - 6 Foot - CAB-00065 - SparkFun Electronics

Lefty