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That doesn't seem very cheap at all to me.
I too was looking at the same scope, though I believe I will go for the manual option. For a power supply I was looking at a Sealed Lead Acid (SLA) battery, something in the 12-20ah range. Though smaller would be fine.. I use a 9ah in my R/C Plane Tote box, which is used to pump fuel and provide power to a starter motor and the glow plugs in the plane, in this use it lasts for months between charges.
I cannot imagine that the goto scope's motors would be continuously drawing very much power but happy for someone who has measured it to give the details.
For the $130 you are looking at with that Ebay pack you could get a decent SLA and put it into a box with an appropriately fused connection for the scope.
That said, something like the jump starter packs on sale at ALDI from time to time would be sufficient and provide you with something that can multitask. Fairly sure it's a 17ah SLA inside (will have to open and look) and they come with cigarette sockets, usb, an air compressor, lights and a nice gentle plug pack charger... and on the plus side, you can jump start your car to get yourself away from the observing site if your battery is found wanting in the cold of night!
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