how far into your previous contract were you in before you extended it another 24 months? typically, if you purchase your phone at full retail price up front, you end up saving money on your monthly plan (I save $15 a month on VZ). coincidentally, you would save $600 every 2 years. there are many financing programs available to, like 0% interest for 18 months, so if you take that route, and decide to sell your phone when you decide to switch phones, it could benefit you financially in the long run. the point being, you're paying that $600 either way, out just comes down to how it's structured.
as far as your question though, some people have suggested signing up for the Rewards app, which consists of a few questions in exchange for 10-35 cents towards your Google Play account. You'll easily accumulate that $5 in a month so hopefully that'll alleviate the burden and you can still get the Nova Prime, which is well worth the cost IMO.
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