Not specific to headphones, but I'm getting a bit tired or so much bait/false advertising.
Fair enough if you run out of stock or its a limited sale, but retailers shouldn't advertise products they don't sell or are obviously/deliberately out of stock (withdraw your ads!).
Here are 2 example:
http://www.dicksmith.com.au/earphones-headphones/sol-republi…
Sol Republic Tracks Ultra MFI for $69.98 (a steal)
Online says its available in store only. Fair enough, walk into store and don't have it. Will check if another store does. Turns out this particular model isn't on the DSE system at all so no stores will have it.
http://www.officeworks.com.au/shop/officeworks/p/bose-ae2-ar…
Bose AE2 Around Ear Headphones for $29 (insane price)
Advertised online quite heavily (AdChoices).
Again, only available online and no stock available in any store around Australia.
End rant.
I reported Harris Scarfe ages ago but nothing came of it. They would advertise that their prices were ridiculously cheaper than RRP. Except that items in question weren't sold anywhere else, and therefore there was no real comparison at all. They tried to say that scales were reduced from $200 to $40 (as an example), where I could find no evidence that the same scales had ever been sold at the higher price.
You must take advertising with a grain of salt. And check online against others to see if they're being at all truthful. Then they get angry because you do price comparisons, but you can't trust anyone these days to tell the truth!