upgrades?
https://www1.sprintpcs.com/explore/ueContent.jsp?scT ... »
That will tell you if it's the $75 or $150 you're eligible for. Either way, that's off the regular price. If eligible for the $150 discount, then there are mail-in rebates on many phones.
Basically, look to see if you have the $150 eligibility then look at the new customer price. If it's just $75, then it's just $75 of full retail.