The surf board plus the waterproof camera and the waterproof tablet all cost : 800 Euros.

Here I give some examples : 

http://www.solostocks.com/img/camara-videocamara-digital-sumergible-5-megapixels-6263806z0.jpg

http://img1.mlstatic.com/s_MLA_v_O_f_4675756472_072013.jpg

http://us.123rf.com/450wm/martm/martm1205/martm120500539/14270533-tablas-de-surf-de-colores.jpg