Alloy is the answer!! Well for non-load bearing things anyway, Bottle cages, headset top cap bolt, brake lever and shifter clamps, etc. . Cheaper and generally lighter than Ti, just don't go using them on things like your stem, seatpost, brake calipers, etc. .
I've got a few little bits and pieces off ebay but they've only been to use in places where you'd feel comfortable using an alloy bolt. I wouldn't trust an ebay bolt to hold my stem together.
If you want to get super bling you can always go for Carbon bolts. At $40 a pop you may need to sell a kidney but they are pretty cool.