@ NASFOREVER... hmmm bro... about Mercedes S-class.. well if u want an affordable model... den u can get a Maisto 1:18 Scale mercedes S-class 1998 ... which is kinda rare though and which means it will be kind expensive... leave out Autoart's and Kyoshos etc cx they are way too expensive.. 
and about RollsRoyce Phantom... well bro i read in an indian forum... that a RollsRoyce Phantom Limited edition has been launched in 1:18 Scale... and in india it costs a
whopping 27,000INR... first of all its not gonna be available in pakistan :P... 2ndly if u wanna buy online... expect somewhere around 30-35,000PKR 