which 4age do you want? there are many varieties,
TVIS, non TVIS, Big port, small port, 20 valve Blacktop or Silvetop.
prices, when i was getting the 4age 16 valve engine, was around 45000 rs but that was 2 years ago, no doubt it much more expensive now. the 20valve engines i have no idea
about turbo, pehlay engine tu kharido, phir turbo ka sochna.