Grin Economy and miner revenue

Yes, there is an ASIC available. The G1 Mini is available in limited supply, still waiting for the shipping which is supposed to be at the end of january. You also have the normal G1 miner, which is basically an upscale of the G1 Mini, so more chips which is not yet available to my knowledge. The graph rates per watt are the same for the G1 and the G1 mini. See link for the product page:
See this forum post of Garry testing the G1 Mini prototype:

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