Pretty much any mobile phone shop now sells (locked down) Linux phones running a Open Source environment (Android).
However, all computer shops in the city center of where I live will _not_ sell any laptop or desktop with Linux pre-installed. Heck the only straightforward and sure way I know of avoiding the "Microsoft tax" on a new laptop is to pay "Apple tax".
BTW, I disagree that the Linux desktops niche has been steady.
The Linux desktop lost a lot of mindset. Some years ago, the majority of people I knew doing academic research used Linux in their laptops. A minority used Windows. Nowadays all those folks that had Linux migrated to Apple.
The biggest player in the desktop market had a huge flop with Vista. Golden opportunity for the growth of any alternatives. My impression is that Linux desktop presence didn't gain much during this flop. Do you think it did?