what will be the best shop to buy IMAX B6 charger with the cheap rate..??

wrong board, please post in wanted section

Even if this is the wrong board;
Buy the b6 from trusted and reliable sources.
Many sellers sell the clone/copy @ 1600-2000 rs. Most of them mention that it is the clone
DO NOT buy the clone.It gives inaccurate readings.That can cause some very serious problems like damaging your lipo after over discharging it.
(P.S- I do not know much about laptop batteries and their specs. Ensure your battery is compatible with the charger. expect a good firework show if correct apparatus for charging is not used.)
Before buying ; ensure that it is genuine.
Or buy a good charger off HK
Some good beginner chargers:
http://www.hobbyking.com/hobbyking/store/__58317__Turnigy_B6_PRO_50W_6A_Balance_Charger_Black_.html

http://www.hobbyking.com/hobbyking/store/__64345__Turnigy_Accucel_6_80W_10A_Balancer_Charger_LiHV_Capable.html

http://www.hobbyking.com/hobbyking/store/__11060__HobbyKing_ECO6_50W_5A_Balancer_Charger_w_accessories.html

I Myself have the Turnigy B6 PRO 50W charger and it is excellent for its price.
Regards