Which is the best place from where i can buy iphone 4?

Try these websites for good deals

freeiphones4me
knowyourmobile
phones4u
direct.tesco

The following factors also play an important factor while taking the decision,

1. Look for any attractive offers from the dealer with the service provider. This saves considerable amount of money for a long run.
2. Try to buy during the holiday and festival season where the market is full of attractive offers.
3. Try to visit the apple store for the deals since its more reliable.
4. See if you can get accessories free when you purchase.
5. You can check for gift certificate in return for the purchase you have made. You can use it for yourself or gift it to your friends or family. You can save money on your next purchase :)