Just dug up the link for someone else, so I figured I'd post the eBay listing for both versions while I have them pulled up.
This is the same back cover as was on the Galaxy Nexuses given out to Google employees on Christmas 2011.
LTE: http://www.ebay.com/itm/OEM-Door-Ba...TE-Galaxy-Nexus-GT-i515-Cartoon-/280947749334
GSM: http://www.ebay.com/itm/Battery-Bac...laxy-Nexus-GT-i9250-Cartoon-new-/271018332585
Disclaimer: I don't know the seller. I just bought from them, and they're the only ones selling AFAIK.
This is the same back cover as was on the Galaxy Nexuses given out to Google employees on Christmas 2011.
LTE: http://www.ebay.com/itm/OEM-Door-Ba...TE-Galaxy-Nexus-GT-i515-Cartoon-/280947749334
GSM: http://www.ebay.com/itm/Battery-Bac...laxy-Nexus-GT-i9250-Cartoon-new-/271018332585
Disclaimer: I don't know the seller. I just bought from them, and they're the only ones selling AFAIK.