Gardening can seem like an expensive endeavor, and it is at first. But if you do it right, and tend it well throughout the season, the fruits (literally) of your labors will not only save you money in the long run, but will leave you quite satisfied. Here are some resources for you to get started and keep going.
I Dig My Garden forum
OSU School of Agriculture
my Pinterest board on gardening
make your own Miracle-Gro
make your own weed-killer (this has the double benefit of saving money and being chemical-free!)