Newegg is not setup to do direct shipments to CA.
If your somehow order a gpu and have it sent to a US address, like New York.
Newegg charges NY sales tax, then when you take it across into CA you will need to pay the gst/pst.
Newegg only charges sales tax where it has a physical location, like California, New Jersey, and Tennessee. New York is a special case because of the new law here.
Currently Zipzoomfly does not collect New York sales tax, and I have been buying more from them over the last month.
Often no tariffs are involved, just the normal gst/pst. That does not mean that you won't get that one customs guy that try's to look good and drops a tariff on everything he processes.
There are a couple of web sellers that ship to Canada, and they do have pretty good prices.