You should assume that the price on the AppStore/iTunes is ALWAYS correct. AppSniper gets its data from iTunes, so it's necessarily always going to be behind the real AppStore. In addition, sometimes price changes may be missed or our servers may be slightly out of sync so you'll see discrepencies.
We have no association with iTunes, and they have no obligation to honor any prices that we show. This is why we have a disclaimer to this effect both in our AppStore description as well as within the application.