It seems like I go to RadioShack every week now. I'm always buying new cables, connectors, and trinkets to try to experiment with my antenna and feed. I always thought I'd one day hook up a scanner to a computer a provide a feed and that was it, no money spent at all. But, it does start adding up when you buy stuff you don't need. Make sure you know what you want before you race of to RS.
If you know what you want, you can easily set up your scanner/feed for optimum reception for under $50.