AT&T, Sprint and Verizon, so those who already have a plan with them may be able to add it on. Lowest prices right now seem to be from Sprint.
via GigaOM by James Kendrick on 11/13/10:
The Samsung Galaxy Tab with Android is just hitting consumer’s hands, and to compete with the iPad it needs apps written to take advantage of the larger screens on tablets. That process is just getting started as this week two such apps were released. The Wall Street Journal launched its Android tablet edition which provides access to its online content using a weekly subscription scheme. Fuze Meeting, which brings remote collaboration to Android tablet users, was also released this week.
Our own Om Malik took delivery of a Galaxy Tab and the GigaOM staff captured the unboxing on video. The Tab is highly portable given its 7-inch form, and only weighs about half what an iPad weighs. The screen on the Tab is brilliant and responsive, and it is apparent this tablet is the first serious competitor to the larger slate from Apple.