Google Voice support ends in May - alternatives?

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http://forums.anandtech.com – I have an ~ $30 Obihai VOIP box that I use with Google voice to get free phone service. I hooked up a cordless phone, and can't tell the difference between this and a landline. Trouble is, I've read that as of about 130 days from now, Google Voice will no longer work with these little boxes, so I'm looking for an alternative. Everything else I've seen charges a cent per minute or more. That doesn't sound like much, but it is a lot more than free. I was hoping to find something that charged about a tenth of a cent per minute. Anyone else on here use Google Voice with a voip bo (Hardware)