Does anyone out there know where to get a relatively inexpensive road bike? Whether new or used it doesn't matter to me, but obviously if it's used I want it to be in good working order.

Also, I've been reading a lot lately about frame composition and was wondering if anyone had tips as to what type of bike to get? Aluminum, carbon fiber etc.

Just an FYI, I don't plan on entering races with it or anything, just riding fast and/or far for the heck of it.