We've waxed poetic about the Motorola SB6141 modem countless times in the past, but today, its little brother is getting a deal. The SB6121 has a slower maximum download speed than the 6141 (172 mbps vs. 343), so you could say it's less future-proof, but it shouldn't be a bottleneck for most cable ISPs for the next few years. In the meantime, it'll have paid for itself many times over by eliminating the modem rental fee from your monthly bill. [refurb ARRIS / Motorola SurfBoard SB6121 DOCSIS 3.0 Cable Modem, $45]
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