Nothing beats Wirefly Friends and Family's $149.99 HTC EVO 3D deal, but several other companies are undercutting Sprint's $199.99 retail price. Chief among them is Amazon, of course, but Walmart's offer isn't too bad either: $179.99 with new contract or contract renewal and $499.99 with no service whatsoever.
Though this leaked poster seemed to suggest it (and it was also to be expected), Walmart has never been named as an official reseller of the EVO 3D. The fact that the store carries both the EVO 4G and EVO Shift 4G makes it a no-brainer, but nothing confirms Walmart's involvement like the EVO 3D's dedicated product page and active preorder button.
Incidentally, Walmart seems to be the only major EVO 3D seller that's not doing any trade-in deals. Everyone else has something: Sprint and Target are paying $150 for an EVO 4G, Best Buy will hand over a $135 gift card or $87 check (as of today) for the device, and Radio Shack thinks $100 is a fair deal for last year's phone.[Walmart Wireless]