There are booster packs for each set/expansion released.
Each year, there is a new core set and three expansion sets released, so at least 4 new types of booster packs would be released.
A Magic: The Gathering booster box usually contains 36 packs.
Typically, a draft in Magic: The Gathering requires three booster packs per player.
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Booster boxes of magic the gathering can be picked up at most trading card stores. Or online at many gaming websites. Some that I have personally used are www.trollandtoad.com and www.starcitygames.com. Both sites offer booster boxes, and singles so you can order single cards that you may be looking for. I hope that helps.
36 packs
A typical box of trading card game booster packs contains around 36 packs.
A draft booster box typically contains 36 packs.
A set booster box typically includes 30 packs.
An MTG booster box typically contains 36 packs.
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There are over 20,000 different cards in Magic: The Gathering.
There are over 60 Magic The Gathering FAQ on WikiAnswers.