Ooma Business Base Station Power Adapter

I need to buy a replacement power adapter for the Business Base Station.
It is probably 5v 3amp
The helpful post at the other ooma forum has everything except this unit.
Here is that link: Ooma Replacement Power Adapters -Ooma Forums

I have search everywhere and even called tech support. They instructed me to “go to the store and ask them for an adapter”
I have also considered buying a used unit for just the adapter but it costs too much.
I do not want to buy those cheap generic adapters that flood amazon and ebay.

Please help. A link to amazon or ebay would be helpful