If you buy them "in the box" they will come with an ISO mount rotor. But you can use them with any 6" rotor.
The $170 sounds like front and rear not each to me
A Travel agent is a pulley gadget used to change the ratio of pull* on a linear pull (v-brake)brake so it will work with a road lever. You can use one on a disc brake for the same purpose.
*I hope I don't have this backwards, it is bedtime: Road levers and old canti brake levers pull the cable a short distance but with a lot of force, linear pull levers pull the cable a greater distance but with less force(Which is increased by the long arm of a linear brake) You need something, like a travel agent) to move more cable and reduce force or you end up with a brake that is really strong and starts working about the time the lever touches the bar. This goes for most mechanical disk brakes as well because they were intended to work with a linear compatible lever.
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I am in the woods and I have gone crazy.