General questions about border crossing

[JPotter]

You will have to pay customs (if not manufactured in the USA) plus GST/PST, no brokerage as you are doing that yourself. Then you have to consider your vehicle costs (gas etc) and your time. If you put no value on your time and someone else pays for your vehicle then you just have entry costs to consider.
If you feel comfortable shop lifting then go for it and try to smuggle stuff across and hope you don't get caught...not my idea of a good time.