You might try calling and see if you get anything different by calling vs at the store. I had received $40/month for everything (local, LD, unlimited) a couple of years ago plus a $5/month credit bringing it down to $35/month. They've increased it by $2 since then. Of course, by the time they add taxes/fees, I've been paying around $53.20/month,
Today, I started the process to port my land land to an extra line on my family plan. It will cost $10/month plus taxes/fees. I figure we'll keep it for about 6 months with appropriate voice message, then cancel that line completely.
Personal Phone: iPhone 4 on AT&T
Work Phone: Blackberry Tour (9630) on Verizon