"but not unreasonable for you to pay for the cab cost."

Not as you relate it, but you've left out one important detail.

He did in fact already pay extra to have his order physically "delivered". They failed to include the entire product in the original shipment, thereby creating the additional expense.

Not his error. Not his liability.
They set the terms, they took his money.
They made the mistake. Their liability.

• That is not being debated by CL.

The question now is what is the least expensive method that would be acceptable to both parties to fulfill CLs obligation.

Ya know While it is primarily a financial issue on both sides, a bit of PR would probably take care of this for many of us. A little mea culpa and a hard luck story would probably sway most. Like:

*Hey we screwed up, but if we have to pay to produce and ship all these extra discs itll mean layoffs here, and delay developments on future products significantly, plus get all of us here into hot water with the Most Honorable Owners.

So, if you can just cover our shipping cost for your missing product, youll be our favorite customer and well give you some sort of compensatory gift certificate or something for your additional expense and assistance in covering up our boo-boo and saving our miserable careers.*

Wouldnt be a dry eye in the house, and I suspect most would jump onboard.