You can buy the Twist It Up Comb on Amazon, where it retails for $29.95. You can also buy it on the company’s website, where it is listed for the same price.

During Season 10 of “Shark Tank,” entrepreneur Noel Durity sought a $225,000 investment for a 15% stake in his company, Twist It Up Comb, an easy-to-clean stainless steel comb designed to ...