Up until now, Google Play was bundling their unlocked Nexus 7 HSPA+ model with an AT&T SIM card, requiring T-Mobile users to buy their SIM card separately. Starting today, Google Play will now offer a T-Mobile SIM card bundle as well.
Other than including the T-Mobile SIM card instead, this is the same 32GB HSPA+ tablet and it still costs the same $299. While this really isn't much of a change, it still means that users can jump right in when their tablet arrives without having to pick up a T-Mobile SIM card first.
Considering how cheap SIM cards cost, it would be nice if Google just included both an AT&T and T-Mobile card with the Nexus 7 3G, allowing consumers to pick and choose which SIM they wanted to use and making it easier to switch between carriers down the road. Of course AT&T and T-Mobile probably wouldn't be fond of that idea.
Anyhow, if you are interested in picking up the tablet with a T-Mobile SIM, it is available now through Google Play.