If starting from scratch the price of a home gym can really creep up when adding equipment you think you need, but may never use. If you want to keep it simple, and to the point, than a Power Rack. Olympic bar (with plates starting at 1 1/4) and a sturdy adjustable flat/incline bench also. Set of adjustable DB's. If you have the bucks, and room, than invest in a complete DB's rack. Warning much $$$$$$$.
Good idea about Craigs list, newspaper ad's, yard sells or even bulletin boards a community centers, stores, etc. Even can put a wanted list or run ad's yourself. Any local gym's, in your area, going out of business or who want to sell older (but still good) equipment? If you do see a good price on what you want, but it has to be shipped, than check the shipping prices per pound. Sometimes the shipping can almost be almost as much as the equipment you are buying. If you got a pickup, and not too far, go get it yourself.
Surprise The Pumpster has not given his expert advise on a BowFlex. The one piece of equipment that transformed him into the mountain of muscle he is today. If you get a BowFlex, I am sure he will come over and help you set it up. He might even stay a couple of night (wanting to share you bed I bet) to make sure you are using it the Pumpster way.