They sell product key cards in stores, but I haven’t seen an actual disc for sale in a long time
Office 365 is their current subscription service and has been available for a few years now. Office 2013 is available as a full-buy product. They each have their place, though I would personally never get 365. That’s not to say I have a problem with sucscription services, however. It’s just not what I want for a productivity suite.
I can see some businesses adopting 365, but not all of them. Businesses can’t always upgrade to the latest and greatest version of Word/Excel/etc because it would break things (like at my job, for example), so using 365 is sometimes a horrible idea.