I don't believe you will see that. From what I can tell, the $5 credit is solely for Apple, and was to help Sprint meet the sales required by their contract with Apple.
I caved and bought a $99 iphone 4 from Radio Shack on black friday, as I had stuck with my Motorola Triumph and it's grandfathered $25 plan that was a big draw. I loved for several years being able to brag about full android, unlimited data and messaging, 300 min talk for $25! Nobody beat that.
I could live with "iphone, $30 a month!" In today's economy bragging about the deal you got is as good as showing off overpriced bling.
The week I waited for the phone to arrive I noticed my area was finally getting the 4LTE upgrade, also came up on a couple hundred bucks, then saw the draconian policies of the itunes store (just creating a password was traumatic!) so cancelled it and picked up the S3 in store. 4LTE over 3g was the deal breaker.
Now that you mention what the $5 was about it even more validates my rejection of Apple and their jack booted, goose stepping business model.
I like Google's "you must now have a google+ account to post comments on youtube" jack booted, goose stepping business model much better.
(I use a Zune for music, nobody owns the pirated content on it but me, and it finds the album cover art for bittorrent downloads automatically)
Apple would be soooo much easier to dismiss if the hardware wasn't so damn exquisite. Yeah that's the word.