Packs of Tenth Edition online have gone down to $1.50. I have bought specific cards for specific decks before, but no booster packs. The set has 110 commons, 110 uncommons, and 110 rares, which means that even if the packs become very cheap the probability of opening the most expensive rare, Crucible of Worlds, is not great. Here are my commons.
Here are the uncommons.
Here are the rares.
The average value for Modern packs is terrible. Buying singles is still the way to go.