Antpool data shows that, with the current Bitcoin mining difficulty and an electricity cost of $0.08 per kilowatt-hour, the prices of several mining machines, including the Antminer S19 XP+ Hydro, WhatsMiner M60S, and Avalon A1466I, are close to their discontinuation prices. The discontinuation price of the Antminer S21 series is approximately $69,000 to $74,000 per Bitcoin, while high-hashrate models such as the U3S23H and S23 Hydro remain profitable at over $44,000 per Bitcoin.