Many e-commerce websites in North America follow the same idea of showing prices with no taxes and other charges before you get to the checkout step.
Bloomen flowers is using hidden cost dark patterns as well. On the product page, flowers cost $59.99 but when you get to the checkout stage it adds estimated taxes + possible delivery fees if it will be outside of GTA (Great Toronto Area)
Most of the time, companies exclude taxes from an item price to showcase the nice price tag (i.e. $59.99) which can confuse customers who wanted to spend less than it shows in the final receipt.
There is a great study by MeasuringU that showcases all problems of flower websites.