Options for itunes-filled disk?
Regarding option number 1, the Apple Stores do not do hard drive upgrades.  You will need to take it to an authorized 3rd party or if it is a recent model MacBook Pro i would recommend just doing it yourself.  It is fairly easy and iFixit has a step by step guide on their site http://www.ifixit.com/Browse/Mac.  A 500gb hard drive should be relatively inexpensive on newegg.com or amazon.com, and i would also recommend going with a 7200rpm.  

I upgraded my late 2009 13" MacBook Pro to a 320gb 7200rpm Western Digital drive from newegg and have been pretty happy with the performance.

For option number 2, all you have to do is drag the tv show out of itunes and on to another drive.  Once it is transfered you can delete it from itunes.  Keep in mind that you probably want to keep a back up of the drive you transfer the shows to or else if that drive fails you have lost the content.