Don't feel bad about it. I felt the same way when I heard. No idea why. I normally don't feel any sympathy for celebrities, but his death is a notable exception.
Sales tax depends on whether or not you are shipping an item to a state where the company has a business address. Data Robotics appears to be headquartered in California. So, if I bought it and shipped it here to Texas, likely there would be no sales tax. But, if they have any place of business here, then I'd pay state sales tax.
If you get one, you must let me know what you think.