Amazon.com is one of the online retailers which will be regulated by the newly-passed Main Street Fairness legislation.
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Michigan residents who buy from Amazon.com and other online stores will be forced to pay the state's 6 percent sales tax starting October 1 of this year.

Gov. Rick Snyder signed the so-called "Main Street Fairness" legislation (Public Acts 553 and 554 of 2014) into law this Thursday. It will require Internet retailers with a "physical presence" in Michigan to collect and remit sales tax on Michigan purchases. Internet retailers subject to this law include Amazon, Overstock.com and eBay, among others.

Steven Depolo / Creative Commons

Kent County is saving tens of thousands of dollars a year on supplies thanks to a customized online auction. The program is like the online auction site eBay in reverse.

When Kent County needs office supplies, like printer paper, it opens an auction online. It lists a maximum price it’s willing to pay based on previous bills. Vendors offer to sell the county printer paper at that price or lower.