T-Mobile finally began sales of the Nexus 6 today, one week after the handset was initially set to make its debut. Like rival U.S. carriers, T-Mobile currently only has the device in Midnight Blue, but while the rest only have 32GB models, T-Mobile is also offering the 64GB model — though it won’t be quite as easy to get hold of.

The 32GB Nexus 6 is available from participating T-Mobile stores across the U.S. and from the carrier’s website starting today. If you want to pay full price for the device upfront, it’ll cost you $649.92; or you can get it on a 24-month payment plan at $27.08 a month with nothing to pay upfront.

If you want the 64GB Nexus 6, you’ll have to obtain it from the T-Mobile Underground, a separate online store dedicated to “hard-to-find, limited quantity devices.” It appears, then, that supplies of this particular handset will be even more constrained than the 32GB model — as you might expect — so you’ll have to act fast if you want to bag one.

Like the 32GB model, the 64GB model is available for $0 down on a 24-month payment plan at $26.19 a month, or you can buy it outright for $699.84.

T-Mobile will also begin offering Google’s new Nexus 9 tablet in early December. It, too, will be available through the Underground store, and you’ll be able to get it for $0 down on a 24-month plan at $24.99 a month. The company only mentions the 32GB model in its press release, so it’s unclear whether a 64GB model will be available later.

• SourceT-Mobile