Will this be the perfect part about asking about robots???
If you are interested in the artificial intelligence aspect of robotics you may want to look at cs berkeley artificial intelligence class online. It is free and has accompanying python projects for developing AI. Here is the site of the lectures http://inst.eecs.berkeley.edu/~cs188/fa10/lectures.html
I somehow am interested to its basic programming and mostly about the hardware ...
You may want to look into the radioshack 'The Great Create' it has beginner level projects for creating simple robots using arduino circuits. http://www.radioshackdiy.com/project-gallery
How much at least will it cost the most expensive among its cheapest kind of robots ??? xD
You will just have to search for the parts outlined in the diy guides on the radioshack website. A fairly simple and inexpensive robot can be built for less than $100 us, but you must make a choice based on your experience and ability.
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