In the Fall of 2015 Lowe’s put out a new generation of their Iris home automation system. A few of the first-generation devices, in this case, specifically the GE switches, also work with SmartThings. These models were being discontinued by Lowes in favor of newer models, and so many Lowe’s stores had them on sale.
They would also generally price match. So if you found one store that had them marked way down, and bought them there, you could then take that receipt to other Lowe’s in other areas and often get the same very low price even if they didn’t have their stock marked down that much.