What are my options to level out my air conditioner?
I would try getting a crow bar or 2x4 under the slab and seeing if you could lift it up enough to get some gravel underneath it to level it off.  Although this could be difficult if the ground around the slab is soft.


  Step 4: Check concrete pad on which
  condenser rests to make sure it's
  level. Set carpenters' level front to
  back and side to side on top of unit.
  If pad has settled, lift pad with pry
  bar or piece of 2-by-4, then force
  gravel or rocks under concrete to
  level it.
  http://home.howstuffworks.com/how-to-maintain-an-air-conditioner2.htm