What’s a good site to fine deals on prepaid phones?

I work for an international camp that brings students and counselors from another country to America for about 3 weeks. We need to purchase prepaid phones for 5 counselors, and I was wondering if anyone knew of a good site to find deal on this kind of thing. Also, is there any way to buy the phones so that they have unlimited calling to certain other numbers, like a lot of normal phones? Thanks

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