Due to the 2018 Wayfair ruling from the United States Supreme Court you may be charged sales tax on orders while purchasing from the Blender Market.
The amount of sales tax charged, if any, depends on your location. If you reside in a state where the Blender Market has nexus (a physical or economic presence) and if that state taxes digital goods then you will see a Sales Tax line item while purchasing.
If no Sales Tax line item is shown then you were not taxed.
This only applies to customers purchasing from within the United States.