How much is texting for a Nextel?

How much is it to add unlimited texting to a Nextel family plan to only one phone? My mom, dad, and I share a 700 minute plan and very rarely go over. But I'm wanting to add texting and wanted to get some prices before I present it to them. I was thinink it was only like $5 a phone a month but I'm not sure. Any info would be nice!
 
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