While there are quite a few places stating lower prices for the Photon 4G, most are geared toward the new line customer. For existing customers wanting to upgrade, usually there is no other recourse than to haggle with the CSR.
But being that existing customers will most likely not use the older phone (since you are getting the new one to replace it), you can probably lower the cost of the new phone by trading in your previous one.
I wrote a review on trade in programs (shown below) and although it's written last year when I was upgrading to the EVO 4G, it still stand true today. I would suggest reading it and looking into the programs and who knows you may get a very sweet discount for your new Photon 4G.
Review: Trade-In Cell Phone Programs
Edit: Just realized that with the Walmart trade in the Walmart Price of $247 goes down to $146 woohoo
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