did he say it was a quote, or an estimate? if it was a quote, i uld say they should honor it. not saying that to rip them off, but if i tell someone a price that ill sell them something, i sell it for that, even if its a mistake. Its kind of like calling up a person selling a car, and he tells you its $5000 over the phone. Then, you go to pick it up, and he wants $6000. You took the time snd effort to get the money snd go pick up the car, and then the price changes.... not too fair.
Personally, if i was the seller (DC) i would feel thst it was my error, and i hsve to take the punch in the gut, and accept the learning experience.
Lets be real, its probably only a 80-100 dollar loss, in terms of profit margins im guessing.
It could be worse, like if he quoted you 500.00 for a custom 6 alt setup or something crazy like that, lol