Best Buy sells a white unlocked Lumia 920: Nokia Lumia 920 4G LTE Mobile Phone Unlocked 920 WHITE - Best Buy. It's currently $367.
I found this thread (Newbie: I am lost as to the Amber update process - Nokia Support Discussions) discussing this phone from Best Buy. It looks like this is a Latin American rm-820, config 059R9W2, Colombian and Ecuadorian country variant. So it should be unbranded and have the complete set of Americas radios like the Rogers variant does, and get full 3G and LTE on T-Mobile USA.
One issue is that this variant does not have GDR2/Amber yet. There isn't even a GDR2 firmware for it on NaviFirm. However since it's an rm-820 I should be able to easily flash another rm-820 GDR2 firmware on it and have everything working. (I'll stay away from AT&T firmware since that always seems to introduce extra drama, remove band support, etc.)
I ordered one today and will post back with my experiences.
Best Buy also sells an unlocked black one, but I didn't investigate whether that one's an rm-820 or an unlocked "international" variant (rm-821) which as we know won't get LTE in the USA.
I found this thread (Newbie: I am lost as to the Amber update process - Nokia Support Discussions) discussing this phone from Best Buy. It looks like this is a Latin American rm-820, config 059R9W2, Colombian and Ecuadorian country variant. So it should be unbranded and have the complete set of Americas radios like the Rogers variant does, and get full 3G and LTE on T-Mobile USA.
One issue is that this variant does not have GDR2/Amber yet. There isn't even a GDR2 firmware for it on NaviFirm. However since it's an rm-820 I should be able to easily flash another rm-820 GDR2 firmware on it and have everything working. (I'll stay away from AT&T firmware since that always seems to introduce extra drama, remove band support, etc.)
I ordered one today and will post back with my experiences.
Best Buy also sells an unlocked black one, but I didn't investigate whether that one's an rm-820 or an unlocked "international" variant (rm-821) which as we know won't get LTE in the USA.