Low Power Board like Arduino

Dear all,

Can some suggest me the low power board which available lowest price working similar to Arduio UNO. Supporting library of arduino.

example:
1)Arduino UNo(Arduino iDE)
2) PIC uno 32 : MPIDE. IDE

Any controller is also ok.
the cost be around 600-1200 INDIAN RS

What do you mean in "low power"?
Arduino board has FTDI USB-to-serial driver, that consumes lots of power.
So you can choose arduino mini pro board, that comes without ftdi and costs about 2-3USD.
There is also voltage regulator that consumes few microampers.
If you remove this regulator and program mcu to go sleep mode, you'll get about 1mka current consumption.