Well, that escalated quickly.
Seriously though, this is pretty impressive. I'd be down for a few.
You don't seem to have considered return costs for the monitor - how will you factor that in?
Estimate probability of return based on industry values for monitor returns as well as defect rates for batches of the chosen panels and then compute the expected cost of each return. Should be able to get a standard error too. If the return rate is low you might have to be careful when computing standard errors for small p_hat.
Also, it will help to have a clear and fair return policy. And since the panels themselves should be covered by some kind of warranty, returns due to defect won't cost us the whole amount. And "I don't want it" returns can be sold as refurbs, if we allow that for the first run. Anyway, it is a good point and I will think about it more carefully.