Well, I took the plunge and ordered the phone after contacting a few people who ordered from this Ebay retailer. I was fearing the worst, especially because the process was so easy.
After ordering the phone on Monday, I got a message from Sprint on Tuesday notifying me of a new charge on my account. The charge was for $249 and would show up on my next bill. The phone was shipped UPS next day, so I picked it up today after work. The phone actually was sent DIRECTLY from SPRINT!!! It had my new phone number on a sticker outside the box, and on the invoice that was inside the shipping box.
I added this phone to a family plan that already had 4 phones, so this line was added for an additional $9.99. I called Sprint and made a few changes to my account to accomodate the new phone, and that was that.
So, it sounded sketchy, but I would totally recommend visiting this ebay retailers listings if you want a new Sprint phone.