The first question you should ask yourself is whether you want to buy an American box or a Japanese box.
Japanese Boxes contain a holo in every pack, however, they do not contain reverse holos, and if there's a secret card in the English version of the set (like Time Space Distortion in MT), it probably won't be in the Japanese version.
Also, with the two next sets in particular, it's even tougher. Our third and fourth DP sets contain the same cards as Japan's third and fourth, but they are split up differently.
Anyways, if you want a Japanese box, get it from Ebay or an online store (like Wakaba). If you want an English one, get it from Ebay or from a hobby store (They're usually cheaper than chains like Target or Meijers).