And they are genuine "Farkarie Rugs"
(Someone will be old enough to get it)
They have changed their advertising in that case and a new advertisment has been made. If you manage to buy something while the current ad is in place you get it, otherwise they are guilty of false advertising.
IBM were caught out by that a few when they had some Thinkpads listed as $200 instead of $2000.
In Australia the retailer is obliged to honour any published price, even if the price is a mistake or a typo in the printing of a catalogue. Failure to do so will leave the retailer liable to legal action if enough people raise complaints to the ACCC.
If all else fails, lower your standards.