Is there anything cheaper than MagicJack VOIP?

I have a server running all the time, so having a computer on all the time is not a problem. But is there anything cheaper than MagicJack where I can send/receive calls from people’s cell phones? This would require any phone number. Thanks!

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MagicJack Company To Offer Free Calls

MagicJack Company To Offer Free Calls
The company behind the magicJack, the Internet phone gadget advertised on television, will soon be offering free phone calls from devices such as computers, smartphones and tablet PCs, such as the iPad. According to a recent Associated Press (AP) report, there are already a number of programs that allow free calling between computers, and also some that allow free, but short, calls to regular …

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