T-Mobile USA has today made the Sony Xperia Z available to pre-order ahead of its exclusive launch tomorrow, July 17. The waterproof flagship can be purchased for just $99 down on T-Mobile’s Simple Choice plan — or $579 if you’d like to buy the device outright — and it comes with a free wireless speaker while stocks last.

The Xperia Z is available in black and purple on T-Mobile (there’s no sign of the white model) and it qualifies for free overnight shipping. Unlock its sibling, the Xperia ZL, which is already on sale in the U.S., it’s both dust- and water-resistant with IP57 certification.

You can get the device for $99 down on the T-Mobile Simple Choice plan, which starts at $50 per month, plus $20 per month for the handset itself. Alternatively, you can buy it outright for $579.99, plus a $10 SIM Starter Kit.

While stocks last, T-Mobile is also throwing in a free wireless speaker, but that’s only available to customers who order online.

• SourceT-Mobile