CDRW on old PC?

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My friend often asks me to burn CDs and now he wants a CDRW drive, but his PC is 100mhz, and has no drive bays, his CD ROM is already external.

I'm guessing this PC could burn at only 1 or 2x with no problems right? And I also noticed external CDRWs cost at least 5 times the price of an internal one, and I only found USBs and I don't think his PC has USB. Also, I dont think he has enough free space to copy a CD to his hard drive.

So is it worth getting a CDRW for that PC? I am thinking his only choice is a new PC, are there any other solutions?

Thanks