Just bought orange soda stream at target guest services (internet pickup)
The clerk working there went on and on telling me about how many people bought the machines, syrups, and got refills of CO2 there. He was really shocked when he was told to store CO2 canisters in the closet at guest services and figured he'd never sell any. Boy was he wrong apparently. He spent about 2 mins. just telling about how much of it sold (and he'd never bought any or really knew what it was).
I'm thinking Target may be the better store for sodastream than wal-mart because the shoppers are a little higher up on the spending ladder and soda's fun and health message should work well.
Target has been underperforming with SodaStream YOY so it wouldn't be prudent to draw chain-wide conclusions from a singular experience. They are doing well with CO2, but machine sales and syrup sales are down YOY at Target.