HTC One Black Unlocked shopping

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http://forums.androidcentral.com – Hi, I'm desperately seeking any suggestions as to what the best route could be for me to get what I'm looking for. I have 7 days left before my 30-days grace return period ends with T-Mobile to return the device (yes I currently hold the HTC One from Tmobile, silver, i haven't been able to sleep, i really want the black version). I really want the black version of the HTC One, unlocked. Questions i have mainly are: 1) I travel frequently, so my prior research has told me that I need to (better) get a GSM HTC One, meaning my shopping options are limited to AT&T or Sprint for the (HowTos)