Bovine fecal matter right back at you.
What you want is massive tax evasion, which simply results in even higher tax rates for those of us who do it the correct way and don't buy under the table from illegal vendors.
VAT fraud is endemic, and can exceed 10% of the revenues. Source: https://www.imf.org/external/pubs/ft/wp/2007/wp0731.pdf
And VAT at least has the benefit of a cross-checking system. A retail sales tax lacks that aspect and is therefore more vulnerable to fraud and evasion.
Last time I ran into a VAT was in Canada. I bought a sweatshirt, finding the price reasonable. By the time the provincial sales tax and the Canada-wide VAT had been tacked on, the price had doubled.
The problem with those taxes boils down to their nature.
While state, county and city sales taxes in one town here are about 8%, in the next county they may only add up to 6% (mostly State Sales Tax), and over in Montana (about 20 miles to the line), there is no sales tax at all.
Vehicles, obviously, get taxed anyway, but If I want to buy furniture or other major appliances that aren't taxed, I check the weather forecast, take the pickup west, and tarp my load coming back.
But, running with the concept, exclude food, exclude medical services, devices, and prescriptions, exclude primary housing, and exclude energy for personal use.
Tax the rest.
And amend the Constitution that no tax be placed on income.