What stores sell nano sim cards for sprint?

I have an Iphone 5c that's connected to sprint. I don't think it's unlocked, but what I'm wondering is. I'm stuck at the activation screen on the phone, and I can't do anything, because I don't have a sim card. So instead of buying one online, and having to wait 11 days. I thought why not just go pick one up. I called sprint and they said they don't sell them. So where could I buy one in store?

Then get a sprint nano sim if it is not unlocked, at a sprint store.

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