In terms of where to buy, TCGplayer is the most reliable option, but also the most expensive, so proceed only with the knowledge that you're paying a premium. Amazon is sticking to matching market ...
TL;DR: The Pokémon TCG: Mega Evolution Elite Trainer Box (Mega Gardevoir edition) is down to $94.89 at Amazon — its lowest price of the year and about $5 off its typical $99.99 price.
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