Colorado has a hodge-podge of sales tax rates depending on where one lives. The dealer I bought both of my tractors charges 2.9%, which is the bare minimum state sales tax rate, and I suspect the state and counties gives a sales tax break for ag equipment. I also think the dealer is located in an unincorporated area of the county.
Now go to a Depot in unincorporated Highlands Ranch (Denver suburb) and I believe the sales tax rate is somewhere between 4.5% & 5%. Go to a Depot or Lowe's in various municipalities and you'll pay 7.5%+/- to 8.5%+/-. One Depot and Lowe's in the nearest town to me has an 8.6% tax rate and the county commissioners cut a deal with the shopping center developer for a 1% PIF (Public Improvement Fee) to pay for the infrastructure. The sick part is the 1% PIF is assessed on the after tax price, which makes for an effective tax rate of 9.63%.
In the Denver metro area, we pay state, county, RTD (bus service), cultural district, and municipal taxes for incorporated areas. I'm sure I missed a tax; but you get the idea.
Go buy a new car, truck or other major purchase in a Front Range municipality and you better be ready to keel over from just the tax bill alone. That's one of the reasons why I always do my best to live in unincorporated areas.