I read a book "Gardening When It Counts" which was pretty good. The author used to be in the seed business, so he was particular and very well informed about seeds. He recommended Johnnys seeds. They are on the net.
Also, you might want to start learning about saving your own seeds what with the unsettled times, and the possibility that Obummer could get another 4 years. Seed Savers Exchange [on the net] is a good place to start learning about that.
You don't necessarily have to buy expensive seeds, some plants have perfect flowers meaning they usually pollinate themselves, meaning that the seeds you save from them will usually give true progeny. Beans are a good example. I have been playing around seeing what dry beans I can grow in my gardens. I have successfully grown several types of beans that I got as beans packaged for food in the grocery store or for rarer things from health food stores. This year I bought a package of 15 bean soup mix and picked out several different kinds that I want to experiment with.