Some are. Some aren't. Some try to trick you. Costco only sell subscription-free models.

If you go to Amazon and look up Brother laser printers you'll see that most of those now also come with subscription plans called "Refresh", so, you can't win.

HP printers with a model number ending in "e" require a subscription. If you avoid the "e" models, you'll get a normal printer.

Costco does not sell printers that require subscriptions. I believe they get custom models from the manufacturer.

Also, the exercise equipment they sell don't require an internet account for basic functionality, and I believe this goes for the TVs sold at Costco as well.

I also have a brother printer that I specifically paid a premium for for out of box eSCL scanner support on linux (airscan). Unfortunately, the scanners still need a proprietary driver as eSCL only supports some fixed resolutions. The proprietary scanner has better/more functionality.