Just plug it in to the USB port on your comp, run cgiminer and you are done.
They were being sold at 1 Btc. But now they further reduced the price to 0.6 BTC/each. They are available right now in the market in India as well.
If not, Let me know and i can ship you from USA
As Benson said, the is the easiest is BFL but again you are looking at 4 month delivery.
Or if you are investing heavily, then look for bitfury or KNCminer.
and which shipping should i choose there are two shipping method
1st standard shiping which cost is 34$
second express shipping which cost 129$
Please suggest me
BFL has started shipping already. Right now they are shipping the 5 GH/s Miner from Nov 14th, 2012 order date and rest from June 23rd, 2012 order date.
If you order today, you can expect for it to be delivered by end of this year.
I don't think Shipping to India is so cheap. Those prices are more of shipping within USA. I remember mentioning that it costed them more than 200 USD. Not sure if it was including customs or just shipping. Benson might be a right guy to answer this.
Just so that you know, i have started sales of USB erupters now. The prices are now reduced to 0.60BTC but am selling for 0.55BTC
More info here : https://bitcointalksearch.org/topic/sales-usb-block-erupters-new-price-of-055-btc-usb-263692