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Hi Andrew.

We do carry a bipolar power supply, but it's easy to make your own if you have two power supplies that output the same voltage. The photo below shows how you'd do it with two separate power supplies.
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By n1ist
As long as the power supply can handle it (ie the current rating on the positive rail is high enough), it should be fine. You may want to run a separate set of power leads from the supply to the digital stuff to reduce the chance of getting noise into the audio side.