HTC confused on upgrade price of EVO?

[bnewt]

HTC EVO? 4G (Sprint) | HTC Online Store (US)

BUY W/ NEW PLAN:
Product Price $299.99
$100 HTC USA Online Store instant discount -$100.00
= $199

UPGRADE W/ CONTRACT EXTENSION:
Product Price $449.99
$150 HTC USA Online Store instant discount -$150.00
= $299

Is the HTC discount the same as the $150 upgrade assistance you get from Sprint if you are done w/ 2 year contract (1 year if premier) or is this something separate?

Their product price without a plan change is $549.99