I've just had a glance at the hiking section of Ebay. There were 4900 items for auction, about 50% of which wouldn't be sold in any outdoors shop (pink fashion backpacks anyone?). Most of these appeared to be on sale from private individuals, a lot seondhand.
There were also 4300 items available at fixed prices from Ebay shops, probably about 75% of this stuff would be on sale in outdoors shop, but as ptc said theres a lot of old stock being sold off. And I know from past searchs that a lot of the stuff is unsold and gets relisted.
There were 27 Montane items available in Ebay shops, down to 16 accounting for different sizes, There a Dynamo jacket going for £55, when I bough one from a specialist supplier for £35 earlier in the year!
As for the reference to North Face, the seller had a Talkeetna jacket for sale at £110, when a quick Google products search showed prices of £105-£120!!
Methinks the shop owner who went puce needs to get a grip on reality 
Edit: I just noticed that theres an ad from the seller of the Dynamo jacket flashing away on the right side of the page!