I suppose it depends where you live, but most Home Depots carry lots of Home Automation devices. They even have their own line, although I don’t recommend it, called “hubspace.” But they almost certainly carry Ring, Philips Hue, Lutron, Leviton, Enbrighten, LIFX, and more. Target and Walmart also offer more than they used to, not less.
Every industry analysis I’ve seen shows that the SmartHome segment has grown significantly over the last five years and is projected to continue growing.
Most of these are behind paywalls, but here’s one that isn’t, and is pretty typical.
Smart Home Market Size, Share And Trends Report, 2030.
A lot of sales have moved online, but that’s true of many retail segments.
As for Zwave specifically, there are a couple of community threads discussing that. Here’s one.