Needed cheapest flight controller with GPS in Bangalore.
Reach me on whatsapp : 7022276817

What do you mean by cheapest. What is your budget. Here i have 2 famous and cheap flight controllers.
If you are expecting normal performance you can go with multiwii328p+gps  and you can get the combo for about 2500. But it has its own disadvantages. Its barometer is not that good so altitude hold is not that good and also compass is on board so there might be yaw error.
If you want good performance go for APM +gps its one of the best flight controllers in the market. Its best deal for bang for your buck.

naza lite and naze 32 both are available at Rcmumbai.com
1) Naza Lite
https://rcmumbai.com/products/dji-naza-m-lite-multi-rotor-flight-controller-with-gps/

2)Naze 32
https://rcmumbai.com/products/jumper-naze32osd-flight-controller-support-baseflight-cleanflight-with-led-taillights/

3)Gps for Naze 32
https://rcmumbai.com/products/gps-for-naze-32-and-osd-with-connector-and-cable/

I have one naza lite if you want send me whats app on 9909916569