Mining Suppliers: I can’t vouch for any individual mining supplier, but companies and products in the space seem to have matured (at least /r/Bitcoin and my Twitter feed aren’t littered with dissatisfied mining customers like they once were)
Why Every Serious Bitcoiner Should Be Mining Again

Aren’t you discouraged that Bitmain is the only reliable manufacturer of fast and efficient Bitcoin miners? Bitmain effectively holds a monopoly on industrial-scale mining equipment. The price of miners would likely be much lower if there were at least two or three manufacturers of miners. The Antminer R4 is a step in the right direction for individual miners, but such a device is still manufactured by Bitmain only, making it rather expensive at its introductory price of USD$1395.

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