Its not a necessity but a useful tool and a lot of fun.
there is a seller on ebay who sells 2 off with charger for £39.99 (split the cost with someone else and its only £20 per car.
http://cgi.ebay.co.uk/Motorola-Talkabou ... dZViewItem
another 2 walkie talkies here for £37.50 buy now or its only at £35
http://cgi.ebay.co.uk/Motorola-T5522-44 ... dZViewItem