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I've got a factory navigation radio that is in very good shape for sale. It is part number 15800000; which is non-lux, so it'll work on any 03-06 full-size with UQ7 Bose. No nav disc or antenna. Asking $400 shipped.
You would need to get an add an amp interface and use an aftermarket amp and speakers. That's what I did with my Trailblazer and it sounds great. These radios have good low level outputs.