Merp

A few days ago, the van would not crank over when trying to start. No
sound from the starter or relay either. Had it towed to a Honda repair
shop and everything checked out OK - battery, connections, alternator,
starter, etc... Also (of course) the van started right up for them.
Now this has happened a couple more times, so it's very intermittent.
It's in the repair shop again, but I suspect they will not find any
problems again due to the intermittent nature. From the first time it
was in the shop, they suggested that maybe it was the starter, but
wanted $400 plus to replace it. I have found referbs for about $140,
and new ones for about $250. Any ideas what else it might be? How
hard is it to replace the starter?

Thanks,
Mike