Navi cost me Rs. 44,000/-. Altis was available for Rs. 45,000/- but frankly speaking I have checked both units & found this one quite better than that in terms of Touch screen response, video quality. You can get from Market but that support Pak Nav maps only. For trakker NAV maps you require Windows based units. I got this unit with 1 year warranty & free software updates for first one year.
Head rest units (Chinese) costed Rs. 8,300/-