Verizon's WP8 flagship, the Nokia Lumia 928 (http://www.gsmarena.com/nokia_lumia_928-5437.php), is available for pre-order (http://www.verizonwireless.com/b2c/store/controller?item=phoneFirst&action=viewPhoneDetail&selectedPhoneId=6751) right now. It's priced $99 with a new 2-year contract or $499 with month to month service. The black one will ship by May 20, but when you select the white model, the "Will ship by..." label disappears.
(http://cdn.gsmarena.com/vv/newsimg/13/05/lumia-928-preorder/gsmarena_001.jpg)
Note that the $99 price is after a $50 online discount. For a limited time you'll also get $25 credit for the Windows Phone Store.
Both Black and White versions of the Lumia 928 are also available on Amazon (http://www.amazon.com/Nokia-Lumia-928-Verizon-Wireless/dp/B00CQAOIIC/ref=sr_1_1?s=wireless&ie=UTF8&qid=1368694531&sr=1-1&keywords=nokia+lumia+928), but there's no shipping date and they cost more - $199 with contract and $549 without. Still, if you're not in a hurry, Amazon usually offers better deals than the carriers some time after a phone's launch.
Via (http://wmpoweruser.com/nokia-lumia-928-now-on-sale-shipping-on-the-20th/)
Alternative Source