Powerstore does not directly handle many of these items, but they can be easily added if you own eCart.
It doesn't have any built in discounts or European tax solutions.
It doesn't have subcategories
It doesn't have search by stock or critical reorder settings
If you try to purchase 4 and you only have 3 in stock on the view cart page it has a message saying you tried to purchase more than were in stock and that your quantity was updated and should be reviewed and the cart would only show 3 items.