I thought that I'd be honest with this thread.

My way of doing it was:

Cost of bike shipped to me and all accessories that I needed.
This included:

• Bike lock
• Bike lights
• Fenders
• Parts (several tyres and several tubes until I determined a combo)
• Consumables (oil and brake pads; now new fenders)
• Bar changes (to a flat bar with grips)

I have distinct feeling that I'll stay around $0.25/mile for a while as bikes take a beating over here between weather and just a beating in the bike racks/locker and from accidents/attempted theft.

I think that it will get cheaper when people have a longer commute (but our $/commute will stay the same).

Anyways, I applaud your suggestion.