It's not always clear-cut...take gas prices, for example: why does gasoline always go up around any holiday weekend? The answer given is increased demand...yet, production, refining, and delivery to the pump takes several months to accomplish. So, to me, that is simple gouging.
On the other hand, we are a capitalist society, and the market drives prices. If a seller has something a buyer wants, the price will be determined by how much the buyer wants what the seller has, and how hard it is to get it elsewhere (availability.)
Yes, there are some who are really making a killing on certain items, but if they are selling these items at high prices it means someone wants it badly enough to pay that price for it. I don't really mind the individual sellers, who are only selling a few items, and won't be my source in the future anyway...what I resent is the large companies/retailers or gun shops who have raised their prices through the roof.
Those are people who I won't do business with ever again, if there is any other possible source, and I have any other possible option.