Good luck getting a straight answer from Samsung Promotions/ Prizelogic
Here is the response I received regarding this issue:
Thank you for your interest in The Notable Savings Offer. You may purchase your device from a retailer of your choice, including but not limited to: Amazon, eBay, Best Buy, or Costco. When purchasing your device from the retailer, please keep in mind that you will not be eligible for this offer if another promotion is applied at checkout. For a definitive determination please register and submit your receipt for our moderation team to review
This is a completely vague response to my direct question. When they say eBay and Amazon, it is likely only through authorized channels such as Best Buy eBay and products sold directly by Amazon. But they wont tell you all of that information until you buy it and enter the serial numbers.