Original Arduino Nano is a surface mount breadboard embedded version with integrated USB. It is the smallest, complete, and breadboard-friendly. It has everything that Diecimila/Duemilanove has (electrically) with more analog input pins and onboard +5V AREF jumper. Physically, it is missing power jack. The Nano is automatically sensing and switch to the higher potential source of power, there is no need for the power select jumper.
Nanos got the breadboard-ability of the Boarduino and the Mini+USB with a smaller footprint than either, so users have more breadboard space. Its got a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one top, power and ground on the other). This new version 3.0 comes with ATMEGA328 which offer more programming and data memory space. It is two layers. That makes it easier to hack and more affordable.
You end up paying less with Nano than Mini and USB combined!

Price:
Price 1200 INR / Piece
Minimum Order Quantity : 50 Pieces
Warranty : Yes
Color : Green
Product Type : Arduino Mega 2560 R3 Board
Base Material : Alumunium
Price 900 INR / Piece
Minimum Order Quantity : 50 Pieces
Warranty : Yes
Color : Green
Product Type : Arduino Due Board
Base Material : Alumunium
Minimum Order Quantity : 50 Pieces
Warranty : Yes
Color : Green
Product Type : Arduino MKR WIFI 1010 Board
Base Material : Alumunium
Price 235 INR / Piece
Minimum Order Quantity : 50 Pieces
Warranty : Yes
Color : Green
Product Type : Arduino Uno R3 Board
Base Material : Alumunium