I have a OBi 110 for many years. I used it for my Google Voice and another SIP provider. But last year, the OBi is not working with Google Voice anymore. Even I flashed the firmware. It extended the life a few months.
I have a brand new OBi200. I bought it in June 2017. Cost me US$47.46 plus tax.
The old OBi110 is much cheaper than before. I paid US$66 in 2012.