The National Express Young Persons Coachcard is targeted at full time students aged 16-26 years old. It allows you to save up to 30% on fares on National Express Coach services.
National Express operate across the UK with a large fleet of coaches instantly recognisable through a white livery with red and blue branding. Services tend to operate between central bus or dedicated coach stations.
It costs £10 per annum or £25 for three years. It can be purchased from their website, click here for National Express Coachcard website.
Unfortunately, you cannot use the card for a further 30% discount on "Funfare" tickets (normally the cheapest travel option avaliable). This is similar to some restrictions on the Young Persons Railcard and Advance Tickets.
Terms and conditions can be found here