I had the worst time trying to source a set of lag bolts for Burning Man online this year. I found them listed on Amazon for as much as $50 a set. This is absolutely insane. I went to the hardware store and put together a set from scratch which cost about $6.
I intend to put together sets like this and list them on Ebay and Amazon at prices which dramatically undercut the competition. The beauty of it is that I can use JIT to eliminate all startup costs by simply waiting until a set sells to purchase the parts.
I have the strong feeling that this will be a seasonal business which peaks just before Burning Man, but there is no harm in starting now.