I'm aware or PfE. Extended and with a rod of lesser Chain spell it takes care of possession and dominate for the whole party, with a few 2nd level Pearls of Power just in case. It requires a bit of forethought but we've done alright with it so far, and the summon protection is pretty handy.
A cheap and effective solution imo since the whole party can share the cost to get it up asap. Being dominated sucks.
The problem with it is that it doesn't protect from Illusion(Pattern) and (Phantasm) spells, Compulsions that don't grant control like Irresistible Dance or Touch of Idiocy, other Enchantment spells like Mindrape, a whole host of psionic effects and fear effects. And our DM
will take advantage of any vulnerability, so that's quite a bit.
So far we've been using the Mindarmor enhancement from MIC and Greater Armor Crystals of Mind Cloaking (and save buffs in general). We're still alive, but it just isn't the same as Immunity.
The only one of those that i have a way to adress is fear. Even then it gets complicated fast if you have to get a seperate protection item/spell for every little thing, so i was hoping for a simpler solution.
We're currently level 11-12 and have a party of bard/crusader/heartfire fanner, wizard/swiftblade gish, summoner druid and an artificer/cannith wand adept so spell & item access shouldn't be a problem.
It's also not quite an immediate problem, just something that came up after the last session because we're getting near the point where Mind Blank is a thing.