[qi:gigaom_icon_fttx] Updated: Comcast (s CMCSA), the nation’s largest cable-based broadband service provider , is expanding its DOCSIS 3.0 super-high-speed (I like to call it Ultraband) network to San Francisco’s East Bay and North Bay areas. Comcast had already rolled out the service in San Francisco and on the Peninsula (also known as the South Bay); now a lot more folks can get the 50 Mbps service. With this upgrade, it seems like the company has cut its prices as well. Stacey reported back in April that Comcast was charging $140 a month for the same 50 Mbps service, but it’s now . Update: It’s being offered for $99 if you also get a second service from Comcast. The upgrade also double speeds for the majority of existing high-speed Internet customers at no additional cost. These upgrades are available across its entire footprint.

Still, if you actually use this high-speed network too much, you’re going be penalized. Remember, Comcast is the chief proponent of metered broadband and imposes a 250 GB cap on the total data you can download over their network every month. Business customers can sign up for the Deluxe 50 Mbps/10 Mbps tier for $189.95/month. Comcast has also launched its WiMAX-based wireless data service in Atlanta, which uses the Clearwire (s CLWR) network. Comcast, an investor in Clearwire, started selling wireless data services in Portland in June.