Reddit mentions of AC/DC Live: Rock Band Track Pack - Xbox 360

Yes. I bought it from Amazon two months ago, brand new sealed in box. It's only $6 https://www.amazon.com/gp/aw/d/B001KAN1VO/ref=mp_s_a_1_1?ie=UTF8&qid=1467177168&sr=8-1&pi=SY200_QL40&keywords=acdc+rock+band+live&dpPl=1&dpID=41q7y-a0MtL&ref=plSrch

You can buy a few yourself for rather inexpensive prices on Amazon. eBay has good prices on some as well. Country 1 and 2 are more expensive though.

Rock Band Track Pack Vol. 2

Rock Band Metal Track Pack

AC/DC Live: Rock Band Track Pack

I don't have a spare code, but it's $3.50 with free shipping on Amazon: https://www.amazon.com/gp/product/B001KAN1VO/ref=oh_aui_detailpage_o02_s00?ie=UTF8&th=1 That's pretty cheap.

I just bought it from the same seller, although for Playstation. And yeah, they're Rock not Metal.

https://www.amazon.com/AC-DC-Live-Rock-Track-Playstation/dp/B001KAMZ8E

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https://www.amazon.com/AC-DC-Live-Rock-Band-Track/dp/B001KAN1VO?th=1

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Buy either new- back of the manual has a code for exporting the track pack into your digital library. Then, the songs will be entitled to your account. These codes can only be used once, so ensure you buy a brand new and sealed copy. The disc can also be used as a standalone, if you don't want to use the songs digitally (therefor you could buy used).

Amazon

I had heard of people who had just redeemed and it let them download. Given it is so cheap, I thought I'd give it a shot thinking that the account didn't see I owned it but when I tried to redeem, it told me I did own it already.

With that said, I should have an extra code at some point but before I give it away I am going to file a ticket with MS I suppose to see if they can fix it for me. If they can, then I'll give the extra away. If the fix is them removing it from my account so I can re...redeem the new code, then so be it.