Sounds like an unfortunate mistake on CTDs part, but they are a VERY VERY reputable online dealer.
Ive spent thousands with them. A year or two ago they had a similar incident; .308's, brass cased for 20 cents a round. I ordered, completed order, was told by email of a misprint a day later. No 20 cent .308s
It happens. Im not perfect and I dont expect them to be either. CTD will always be one of my go-to sights for firearms gear.