To apply different prices based on location (i.e. if you’re in the US you get one rate, if you’re in Uganda, you get a different rate) :
Go to Tickets & Fees to create a sample ticket type.
Then go to Form builder > Attendee registration form (with tickets) and create a country field.
Finally, go to Discount Codes Manager and create a discount code and set it to be valid for selected countries only for selected ticket types.
As a prospective attendee, you would go to the website and select your tickets you would like to purchase, fill up the form and enter the discount code in the Apply discount code field. That would give attendee a discounted rate on that ticket type's purchase.
