Hopefully you'll soon learn published inflation numbers are taken by reviewing a SAMPLE of products and services in the country and represent a statistical average of costs - it's not just the cost of products sold. As such, it's not an absolute when you apply to an individual market, which may be moving at its own pace for various reasons (component prices, market shifts, new competition, etc).
Don't take national inflation numbers as some absolute that you apply blindly. I find it funny you discount an organization that specializes in the industry and historical tracking of the metrics in it.. in favor of a pure statistical average for the entire country.. calculated by a website by some random dude.
We all took ECON in college.. another one of those general studies classes us engineering majors looked forward to because it wasn't a meat grinder like our real course work.
Yes.. which is ironic then why you prefer random-web-dude over boxofficemojo..