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If a new one is out of the question, I recommend you buy a larger hard disk. My guess is you will be better off having a technician install it for you. That way the tech can take care of backing up the files from your old hard disk and putting them on the new one. But you'll pay $50 or $60 for the disk and maybe that amount again - -- or more --- for the file transfer and installation. Considering that some very nice computers are available for $500 or less --- well, you get my first point.
If your computer was a little younger, I would have recommended an external hard disk. However, for an external drive to offer decent speed it needs to be connected via a USB 2.0 port, and I'm sure your computer won't have one. That means you'd also need to add a USB card and that would --- even if you do the labor yourself --- add $40 or so to the cost.