Options replacing seized rear brake caliper...?

[MorganS13]

Ok well my drivers side rear brake caliper seized over the summer and this weekend for some reason the caliper decided it wanted to start movin slightly enough that it rubs against my rusted rotor when i'm movin at low speed and even louder when i'm braking... i already have brand new Nissan pads and Brembo rotors that i was smart enough not to put on this summer till i got a new set of calipers.  my big question is are there any other options other than payin $100+ each for a new set of rear calipers? i know i need to replace both sides at once so thats no question.  i was thinkin bout goin to a junkyard and gettin a set of calipers but then my smart self realized they'd probably be seized as well. i heard somethin bout rebuilding calipers but every brake shop i've talked to said they jsut replace them, any ideas??