You can go to any home improvement store like Home Depot, Menards, Lowes, etc. and buy decent speaker wire piced per/ft off a spool. Don't pay extra for name brands like Monster. Or, as the others have said, monoprice.com online is a great resource with killer prices. For the sub you need coax with rca ends, monoprice has them as well very cheap.
You don't need to have someone calibrate for you, it is not that hard, and we can help. Basically, you want all your speakers to be matched. Most receivers have built in test tones that you run from speaker to speaker, the goal is to get them all at the same sound level. Some do this by ear, but you can also get an SPL meter from Radio Shack. If your receiver has a built in setup option with microphone, those do a great job as well setting speaker levels and speaker distance from the listening position.
