mynewmodem.com, ownyourmodem.com, Comcast.net, EBay.com, close enough for the interwebs.........
I'd trust Amazon to weed out poor vendors before I would EBay. As well as handling any seller 'problems' better.
Even from 'Bargain Equipment', who's Comcast/Amazon listing, BTW, does reflect their J model Zoom as being 'New' not 'in new condition' as ownyourmodem does.--
one should not increase, beyond what is necessary, the number of entities required to explain anything