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^^^^ @Bextreme04 steered me in the right direction for a PCM last year, he seems to be the most knowledgeable on ECM/PCM stuff on this forum.I just searched around a bit and bought one on ebay, with pigtails, for $50. Just look for an 0411 PCM. It won't matter what it came off of, since it will have to be messed with no matter what. At the very least you will need to remove VATS. If you have an android phone or tablet, you can get an OBDX Pro VT tool for $60 or an OBDlink tool and download LSDroid. You can then flash any stock or tuned BIN file you want very easily. If you have a windows computer, the windows version of LSDroid has the stock, known good, BIN files built in for you to be able to flash.
The 0411 PCM came in a ton of vehicles and will likely need to be reprogramed no mater what it came out of or what it goes into. Even into the same make and model with the same equipment and gear ratio would probably have VATS issues when connected to a different BCM.I'm looking for another 00-02 Silverado PCM.
I program them for LS swaps. A lot of times the customers bring me their ECM. Getting a bit low on the 411.They are still pretty available for me. The prices seem to be up on ebay and availability is down. Looks like programmed ones are running about $120 now and a set of pigtails and connectors are around $20. I think I can still get them every once in a while at my local pick n pull for about $40-50 for the pigtails and ECU.