How much does this cost to the nearest dollar?

Malibu Low Voltage Transformer 300 Watt for Outdoor Landscape Lighting with Photocell Sensor Timer and Weather Shield for Spotlight Floodlight Garden Pathway Light 120V AC to 12V AC
WHAT YOU SHOULD KNOW ABOUT THIS FIRST? For the transformer's stability and longevity, we highly recommend that the total wattage of your lights had better not exceed 75% of Transformer’s capacity. x 75%= HOW DO WE CHOOSE THIS? 1. Count the total number of lights which will be connected to this Find wattage on lighting performance chart on the back of the light fixture Select a compatible Determine wire gauge. WHAT ABOUT THIS? High-quality TransformerWithstand Harsh Outdoor ElementsReduce household electrical current output from 120 volts AC to a much safer 12 volts outputQuick & Easy Installation

Price is $170.00
Price: $169.99