Visitors to the Sony Store UK can now reserve a 16GB Wi-Fi-only version of the 10.1-inch, Full HD tablet for £399, while the 32GB device can be snapped up for £449.
The online shop also lists a 4G LTE version of the device (believed to be priced at £499), but is not accepting orders yet, meaning that device is unlikely to launch until later this year.
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The company is offering free shipping on all orders with an estimated delivery between April 12-15, which is the closest to an official release date we've heard yet.
The Xperia Tablet Z, which is waterproof like its highly-rated smartphone namesake, emerged as one of the most promising launches from last month's MWC expo in Barcelona.
With a quad-core processor, the promise of an Android 4.2 update, a super-slim and light premium Sony design language, it certainly impressed during our hands-on review at the show.
However, the majority of Android tablet buyers opting for cheaper, yet surprising high-spec devices like the Google Nexus series.
Does the higher-priced Sony Xperia Tablet Z have enough in its locker to convince consumers that the extra expenditure is worth it?