Destination Coupons offers a Big Bus Hop On Hop Off Las Vegas Bus Tour in Las Vegas, NV, for $21 via this printable coupon. (Select "Click here for your Coupon" to see the coupon.) That's a savings of $18 and the best price we could find. There are two routes and one full circuit of each route takes approximately 1-hour 30-minutes. Reservations are not required; the coupon must be presented before boarding the tour. Book this travel deal by December 31.
Of note, you can also get a Child's Ticket for $21. That's another low by $8.