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If you're set on Toyota calipers then this will be of no help, but I just picked up a pair of the remanufactured 13WL calipers from AutoZone last week and paid a total of (funny...my BB kit 6.0 kit literally just arrived from Sonoran Steel as I'm typing this, anyway...) $265, that's including the core charge of $80.
Well I read through every big brake upgrade post there was (all you really need to read is this from bigfishallday: http://www.toyota-4runner.org/3rd-g...ements-231mm-13wl-tundra-calipers-rotors.html ) and it seems like the consensus is that remanufactured calipers and OEM pads/rotors/pins/clips are the way to go for the best bang-for-the-buck. Admittedly if I had no budget, I'd have gotten the Toyota calipers too, but the $ difference was significant. I'm also opting to upgrade to stainless brake lines (ordered from Wheelers) while I'm at it. I'll let you know how it goes.