Look, the price is the price. If the price is good, pay it. If not, try to negotiate or walk away.
Prices change, it doesn't strike me as unethical when they are raised, nor do I feel unethical when buying below cost. I continue to shop at over-priced retailers because sometimes I find good deals at those establishments. I don't shop much anywhere I don't find good values, but don't think less of the owners and employees at those places.
Wine-searcher lists bargain prices sometimes, too. I've found a few good deals there and I don't even have the premium membership.
[I guess we're having a a similar reaction to the apparent wave of belly-achin']