Can we get hold of the Mandolore special metal? called manda its only exist on mandalore and is known to be one of the few metals that can block Lightsabers..

Yes in the future that will be possible but only if you are graduated as a Bounty Hunter, and if you are able to afford it.

well how much will it cost?

This metal won't be sold seperatly, so the armour would cost about 5,500 Credits.

then im gonna start getting money soon i hope.

Well that depends on how good you are as a player. Anakin, for example, has handed out a mission to 2 of the members already. Depending on their success and more importantly, their creativity in getting that success, they will be granted a fair ammount of money.