my name is akash. i am building a quad from scratch.
i've got everything but a module to fit into turnigy 9xr.
can you suggest me where can i find a used one as new is
not an option.  

Only serious persons shall reply, already fooled for 3 weeks by someone.

Hobbyking.com

Hi,
Akash

You can buy this and use in your 9XR Transmitter.
Open LRS 433MHz Transmitter 1W + Open LRS 433MHz 9Ch Receiver
Buy-
http://www.rcproduct.in/combo-offers/50-open-lrs-433mhz-transmitter-1w-open-lrs-433mhz-9ch-receiver.html