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Troy, you might want to search the threads. There is discussion of Jaycar and Dick Smith power supplies.
I bought a Dick Smith Electronics one which is fine for me. However, I don't drive a goto mount with it, just heaters and stuff. Grabbed it on special - they come round on special at Jaycar and DSE every so often. I think it is 20A and it's probably best to get a higher current rating to ensure it has plenty of capacity to do what you need without running close to its limits. The DSE one I bought allows adjustment to the output voltage and I brought it back to close to 12V.
The only other things I had to do was to disable the light n the on/off switch and swap the bright gren LED for a faint red LED. Otherwise, it lit up half the observing field!
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