So a 61% price hike over 5 years, of which 24% was just inflation. If the total price really went up 200% in your country, that's exceptional and probably caused by policies unique to your country.
btw you can't compare prices without shipping because there was never an option to buy 100 at $15 each and amortize shipping. Retailers treated it as a loss leader with a limit of one per purchase, often forcing you to buy some extra junk to meet the order minimum.
Amazon/eBay prices are indeed gospel. You can ship something like this across the country for <$5 so location doesn't matter unless you're talking tariffs
Is 10%/$1.50 enough to pay for the retailer's freight, ~3% fee to accept credit cards, inventory carrying, rent, payroll, shrinkage, support/RMA, and fraud?
https://data.fca.org.uk/artefacts/NSM/Portal/NI-000098822/NI...