I just purchased an order online and the company is from Australia. Upon checkout, I've noticed that there were CA Sales tax included (not VAT/Import Duty). It's kind of weird that the retailer based in Australia is charging CA state tax so I was wondering if this is normal? I did contact the retailer and they told me each state has a thresholds for online sales sold. Since they exceeded the California threshold, they have to register for sales tax. Is this true?