Which is a good place preferrably close to nana in bangkok to buy a motrola mobile charger,at a good price?

There is a little mobile phone store inside the Nana skytrian station. They may have Motorola chargers for sale. If you want a guaranteed shop in which to buy a motorola charger (i.e., if you go there they will definitely have what you need) then go to 4th floor of MBK. To get there, go to the nana skytrain station, buy a ticket to the national statium (switch trains at Siam Station--just walk across the platform and get on the ajacent train). Once you arrive at the National Statium Station, just follow the crowd as 70% of the pengers are headed to MBK.