The HTC One is out for more than one month now but only the white variant was launched. But now, you can buy the Stealth Back HTC One online from AT&T in both 32GB and 64GB variants.On a two-year contract, the device is priced at $199.99 for 32GB of native storage.
AT&T does have an exclusive on the 64GB unit, which is priced on contract at $299.99. On the other hand,if you buy the device off-contract it will cost you $599.99 for the 32 GB model and $649.99 for the 64GB model.
here