Two For £20!

Tell me if I'm completely out of the loop, but a customer has just been into the showroom with two sealed units he wanted re-making as the supplier he went to made them wrong. The unit sizes were 871mm x 347mm and had 18mm white internal Georgian bar, silver unit spacers, Cotswold obscure glass and toughened safety glass as it was for conservatory top lights. He told me he had paid £10 each for them! We were quite a bit above that when I quited him. Perhaps we are just two expensive, or was £10 each, bearing in mind the specification, too little an amount? Thoughts please!