Some airports, like Incheon , might offer what looks like a deal, but high import taxes or unfavorable exchange rates can quickly turn it into a "rip-off". The "Infuriating" Life-Saving Story
Retailers often increase the base price before removing the tax. This means the final price can be higher than what you'd find at a standard electronics store or online.
Duty-free is generally better for high-tax items like alcohol and tobacco. Electronics like Bose rarely see significant discounts because their base prices are already high and tax impacts are minimal.