Amazing price, the LEGO City 60304 Road Plates are just £8.87 at Amazon with free Prime delivery or £4.49 under £20 for non prime.
I expect these to go quick to buy quick if you want some.
Product Description (copied directly from Amazon
This LEGO City Road Plates (60304) building set adds a realistic backdrop to kids imaginative play, with glow-in-the-dark toy streetlights, traffic lights, road signs, traffic lane markings, speed bumps, a crosswalk, trees and greenery. Kids can place the Road Plates their way, build a city around them and connect to other LEGO Road Plate building sets to expand their city creations.
The LEGO City Road Plates building set comes with an easy-to-follow building guide and Instructions PLUS – part of the free LEGO Building Instructions app for smartphones and tablets. This interactive construction guide with zoom and rotate viewing tools quickly helps young LEGO builders become master builders.
LEGO City building sets stimulate open-ended, creative role play with feature-rich buildings, realistic toy vehicles and fun characters that deliver an enjoyable, fun-filled play experience based on real-life events.
The primary Road Plate layout measures over 5 Inch (13 cm) high, 17.5 Inch (44 cm) wide and 15 Inch (38 cm) deep.
Contains 112 pieces.