Underneath the main ad at the top center of the page is a long, thin horizontal bar. Inside that bar is an ad for 20% off your next shoe or handbag purchase when you sign up for their Amazon Shoes email advertisements.
Several varieties of Clarks Desert Boots are on sale right now including the popular Beeswax ones. Prices vary along with color/size, but many of them are on sale for $79.54 or an amount close to that.
$79.54 minus 20% (15.91) leaves a final price of $63.63.
BTW you'll probably want to order them a half-size smaller than your true size, these are known to run large.