As of January 2016, Rethink had received $115 million in investment and had sold only 900 robots.[1] They were selling the "Sawyer" robot by then, but no sales figures for that seem to be available. About 40% of Baxter sales were to research labs.

[1] https://robotenomics.com/2016/01/11/the-facts-about-co-bot-r...