Can anybody tell me the cheapest way to connect an arduino over internet via wifi
here we go my friend... only $5 - ESP8266 WiFi module
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You need to get an arduino wifi shield or module. You can shop around from reputable electronics suppliers like adafruit or sparkfun or take a gamble on the cloned boards out on the open trade market. Good luck.
i live in india and here wifi shield is very costly i want a cheap way except the wifi shield
You can check out rhydolabz or protocentral which are resellers of sparkfun/adafruit and sell online cheap but trusted stuff as well in India.
Since wifi frequency is regulated you might have a tough time as an individual to develop something on your own and will probably cost you more to put together transmitter and receiver elements together to rig up such a system. I think even trying to get wired ethernet for an arduino to a spare access point router would be more effort than trying to get a shield specific for wifi. Sorry, maybe someone with more electronics experience has suggestions.