Reader Matthew Barnes points out that the Build Your BMW online configurator for the M5 is now available on the company's US website, meaning that at some point, prospective buyers can sign away internal organs or first-born children and place their orders. Sadly, though, this does not mean that there will be a firesale on used E39 M5s at any point in the near future. I played around with the configurator, and managed to price it up to a tick over $91,000. No gearbox option is shown at this time. Could someone please explain why folding rear seatbacks are a $475 option on a car this expensive, when it's standard equipment on a lot of $20,000 sedans? Come to think of it, there's no way I'd be complaining about such a thing if I had the sort of coin required for this car, so I guess that answers my own question.