Motorola's much anticipated circular smartwatch, the Moto 360, finally goes on sale today. The base price is $249.99 with a choice between a black or limited edition gray leather strap, but there are also two metal versions — one pictured above — coming this fall for $299.99. If you can't wait for those now, you'll be able to buy a metal band separately for $79.99 later on. Leather straps, meanwhile, will cost $29.99 by themselves.