This might've been covered before, but here goes.
I spent an hour or so in the garage on Saturday doing a little 'make' for my SEAT Altea.
Offcuts of wood and four cheap cupboard door knobs from B&Q
Voila! Ghetto iPad headrest mount (copyright and intellectual property of iPadForums.net member iain1970) so my toddler can watch his favourite CBeebies programmes on longer journeys.
Total cost £0.96 plus the scrap I already had (I somehow managed to get two of the knobs for free going through the painful self-scan checkout). I've painted the whole thing black using some old enamel paint and a 1.5" brush. Overall, it looks like a piece of crap, but it works and wasn't £70 for a Brodit one.