I touched a bit on this before in a previous thread [here], the available brands were LG Watch Style, LG Watch Sport, Moto 360 Sport, Fossil Q Founder, Tag Heuer Connected, Moto 360 for Women, Asus Zenwatch 2, and Moto 360. Most ranged between 150$ to 700$, some for a rediculous 2500$ to 3500$ like Tag Heuer. The Asus Zenwatch 2 comes in more affordable at 150$, there's a review of it [here]. I've also seen a monthly payment plan for the LG Watch Sport at 66$ a month for a total of 350$.
Edit: [Here's] a more up to date listing of smart watches with android 2.0 support, and some more recent watch [reviews].
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BrushTone v1.3.3: Accessible Paint Tool
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AudiMesh3D v1.0.0: Accessible 3D Model Viewer