[PF] How to get Immune to stuff?

[Krazzman]

Hello again Playground,

because we are going to fight a Strength draining mix between Dragon and Basilisk soon in our Pathfinder game I had some time for thoughts.

What are the expected Levels to be Immune to [Effect] and how to reach it without having to specialise in certain classes?

Example:
Poison Immunity for our Barbarian?
Petrification Immunity for our group?
And so on.

Thanks in Advance.

[Krazzman]

To rephrase my question:
What are, similar to another guide found on this forum for 3.5, the "Cheap", "Good" and "Avoid" ways of getting Immunities/special abilities.

Poison Immunity:
Druid or Serpent (Domain/Bloodline?) or Periapt of Proof against Poison/Disease or else...
Petrification (?) haven't found anything...
etc.
Miss chances:
Capes/Spells cast on you?

I would like to know that since I can Craft Wondrous Items and would like to start building these Items. I have severely limited supplies and I want the enemy to no longer have the power to drain the power of our Main Damage Source (Our Barbarian). As well as getting to stay alive too.

[Need_A_Life]

Well, for starters there's the continual Protection from Evil spell (2,000gp; CL 1)... which is incredibly broken.

Cheap immunities will tend to be that.

[Crake]

Well, for starters there's the continual Protection from Evil spell (2,000gp; CL 1)... which is incredibly broken.

Cheap immunities will tend to be that.

Being a minute per level it would actually be 4000gp

[Krazzman]

Well, for starters there's the continual Protection from Evil spell (2,000gp; CL 1)... which is incredibly broken.

Cheap immunities will tend to be that.

Does Continual mean always on in this case?
When I dispel that magic item it gets deactivated for a few rounds/minutes/hours/days and not outright destroyed so I have no need to built it higher than CL1, right?