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Easiest way to prevent the spellcasters trying to escape is slapping the 'Manacles of Cooperation' on them.
It's a mearly 2000gp and completely subdues them.
"These tight iron cuffs can fit over the wrists of any Large or smaller humanoid. When placed on a helpless humanoid, they make the captive more docile and compliant. The prisoner never attempts to escape of its own volition and agrees to any reasonable request unless it makes a DC 11 Will saving throw."
Ok the saving throw is low, but that only effects the 'reasonable request' aspect of it, the never attempts to escape aspect doesn't get a save.
And even if i'm wrong, once you've captured them just have the person who captured them feed them 'Striped Toadstools' for a mear 180gp per toadstool, you can deal between 4-12 wisdom damage and 4 int damage (thus ruining their will save and allowing the manacles to work). You could also take into concideration that you need either Int/Wis/Cha of a certain level just to cast spells in the first place, so just by draining those abilities soon they wont even have the ability to cast.
You'll need a fair few of them to keep them subdued, but it is cheap and simple. The spellcaster might figure out his food is poisoned, and refuse to eat, but after a few days of no food, they'll be too fatigued/exhausted to cast anyway, you just have to remain extra vigilent for those first few days until they're too dumb or too hungry to cast.