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Wrong.
Sales taxes are a tax on the 'seller'.
If sellers could so easily have charged their buyers another 6-8% in product pricing (sales-tax equivalent price increase) -- they would already have done so to maximize their seller profits.
That's how markets work. Would you intentionally sell your car, house, or EBay stuff for less than buyers were willing to pay for it ? If you added an automatic 6-8% 'Special-Zonie-Sales-Fee' to all prices of your stuff for sale -- do you think potential buyers would just pay it without considering it in their purchase decisions ??
Market prices are determined only by 'Supply & Demand'. That's Economics 101 everywhere.
Government imposed sales taxes do not change either the market supply nor demand for particular products. Therefore, any sales tax levy can only be taken from the seller -- because buyers overall will not pay more than market prices. It reduces seller profits and increases seller costs. Sales taxes are ultimately an income tax on sellers (...and sellers are also forced to be unpaid tax-collectors for the government).
Sales taxes are not shifted forward to buyers. If that were true, consumers could just shift the extra sales tax cost to the buyers of their labor (employers) thru higher wage demands; it would be an endless circle of shifting, where nobody ever really paid the sales tax (??)
Amazon.com gets zero subsidies from any government sales taxes -- only reduced profits & sales.