I really hope y'all don't sell a DOCSIS 3.1 Cable modem under $99 soon.

earlyre thought this was worth mentioning said
5

Spectrum recently upped our D/L Speed from 100Mbps to 400Mbps.
the ol’ trusty Arris SB6121( bought Refurbished in '17) is only DOCSIS 3.0, and wouldn’t support the new speed…
did a little research, settled on a Refurbished Netgear CM1200 from Amazon (Sold by Woot!) for $99.

it came today, hooked it up and activated, and WOW! My D/L speed is now 4x faster. (upload is still a paltry 11Mbps)
this whole broadband thing is pretty neat!