Are both the digital coax and the optical out not working?
That's a bummer. I have an SB3 that has a dead left analog channel. Apparently, that's a common op-amp failure on the SB3s. I hooked it up to a DAC and it's been fine ever since, but I hadn't heard of too many units where the digital outs are gone.
You could get a Raspberry Pi and run Squeezeplug on it, if you have a USB DAC, or pick up a used SB somewhere.
There's also Community Squeeze, or RaspyFi.