TiVo Roamio OTA 1 TB DVR - With No Monthly Service Fees $299.00 on sale! Should be in stock on November 27, 2017.
Sounds like a good buy if looking for a Roamio OTA.
The Bolt and Vox is their newest line. The Vox is just a Bolt in black with a different remote. I think all the Bolts on their sales page are coming with both the old remote and the new Vox remote. The Bolt will do 4K and the Roamios won't is the biggest difference, and the Bolts are a little quicker.
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Note that this the 500gb TiVo and not the 1TB TiVo that Amazon has for $299.
Also, the Roamio OTA comes with the guide service at no extra cost, while the Bolt requires a $15 per month service plan and works with cable.