Hi tk123. Are you in USA or Canada?
Anyway, it seems that the naming of different creams depends on your country.
https://en.wikipedia.org/wiki/Cream#Canada
Here in Australia standard cream is 36% and double cream is anywhere from 48% to 60%.
In the UK standard in 36% and double is 48% +
BTW. Prices of cream and butter have gone up a lot in recent years unfortunately. Several years ago butter fat was almost considered poison here, due to the relentless low fat push and an almost demonization of fat. After recent studies finding several health problems associated with low fat dairy, but not with full fat products, the demand for low fat stuff has reduced, and hence cost of butter fat has risen sharply. The main reason is actually just that not so many people want skimmed or reduced fat milk these days, so there is less available for them to skim off to make butter and cream and cheese.