Amazon is rolling out the just walk out technology in whole foods stores. Only a couple have it now, but I imagine it won't be long until the rest do too.
Felt like a "scaled-up" convenience store. Not having a line was very nice.
If you're wondering how it detects the produce, produce in the US has tiny little stickers on it or at least a PLU code where its sitting. You enter that 4 digit code and it gets weighed.