Half price because of a buying mistake, not a product one
Why they are cheap
We ordered four hundred and sell about eighty a year. Holding five years of stock costs more than selling it at half price.
What is wrong with them
Nothing. Same batch, same guarantee, same everything as the ones at full price last week.
What we learned
To order against actual sales rather than against a hopeful forecast. It is not the first time and it should be the last.
