Where to buy Google Nexus 6 online at cheapest price?

Here are a few online opportunities to buy Google Nexus 6 -
FlipKart
You can get Google Nexus 6 on FlipKart at Rs. 43999. They also have EMI offer, the EMIs starting at Rs. 2134 for 24 month tenure. Other tenure options are also available.
You can also go for exchange offer wherein you get the Nexus at Rs. 33999. This is how you can go for exchange offer-
1. Provide the old device details on the exchange form. Only select devices would be eligible. List of eligible devices is available on exchange form.
2. Before buying, confirm the offer availability in your city by entering PIN Code.
3. Once the order is placed, your product will be shipped. Hand in your old device at the time of delivery.
Google Play Store
You can also buy the phone on Google Play store at Rs. 44000 for 32 GB version and Rs.49000 for the 64 GB version. However, the product is out of stock as of now.

Google Nexus 6 can be purchased at two places:

1. Flipkart
2. Google Play Store
There's not so much difference in the price at the two stores.

Flipkart

Google Nexus 6 ( Cloud White,Midnight Blue with 32 GB)
Price Rs 43,999

Google Nexus 6 ( Cloud White,Midnight Blue with 64 GB)
Price Rs 48,999

Google Play Store

Google Nexus 6 with 32 GB (Midnight Blue, Cloud White)
Price Rs 44,000

Google Nexus 6 with 64 GB GB (Midnight Blue, Cloud White)
Price Rs 49,000
Note-The phones are currently not available at Google Play Store.

As per my opinion Flipkart will be the best option to buy Google Nexus 6 online at the cheapest price. You can easily get it on Flipkart at two different variants:

Google Nexus 6 with 32 GB
Price Rs 43,999

Google Nexus 6 with 64 GB
Price Rs 48,999

Google Nexus 6 is available in two variants - 32GB & 64GB. One can buy the same through online magastore Flipkart or via Google playstore. Both variants are priced same at Flipkart & playstore. Neverthless, the Google Nexus 6 with 64GB is yet to be available on Playstore.

If you want to avail some offers that help in buying the device, then, it's good to buy the phone at Flipkart. You can buy Nexus 6 with 64 GB from Flipkart priced at Rs. 48999 using EMI option starts from Rs. 2,376. Also, you can return your old smart phone and get upto 10000 discount. This device is available in two colours - Cloud White & Midnight Blue.

While the Nexus 6 with 32 GB is priced at Rs. 43999 with EMI starts from Rs. 2,134. Note that you will also get 1 year manufacturer warranty for Phone and for in the box accessories.

Check this link for more details: https://www.google.com/nexus/6/