Above is one of the first things I got, the trading card tin gift set. In this tin you get 6 packs of trading cards, an exclusive Twilight Sparkle foil card, and a checklist/poster. In each trading card pack you get a 4 trading cards, a tattoo sheet, and a foil or popup trading card! The 3d popup cards are awesome, there are 9 possible cards to get, the mane 6 and cutiemark crusaders. All together there are 84 regular cards, 43 foil cards, 9 pop ups, 12 tattoo sheets, and 8 gold series cards. Not all of these cards are available in the trading card packs, for example there is a collector's binder that comes with 6 exclusive foil cards. The card packs are typically a couple dollars a piece, and are found in the trading card section of your store. There are also the tin gift set of course, and the 30 card box set that comes with one of the four exclusive box toppers. Looking online it seems it may be rather difficult to get a complete set, most of the special foils were given out at different Conventions, making them only available online.
If your store doesn't have these, I would say don't worry and just keep checking. When they first came out the company literally ran out of stock and had to reprint all of the cards, it is possible they could fully run out of stock again. I highly recommend checking into these trading cards, the artwork is beautiful and features many different ponies and scenes.