I just got this new FrSky Q x7 16-channel telemetry & s-bus radio from Amazon (prime) for $105 (vendor: HeliDirect)

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

and occasionally you can get it even for less. There is a (very) slightly new model Q X7S so that explains the price drop.

Mine arrived in two days because of Amazon Prime, if it comes from china it takes a bit longer

I also got a FrSky X8R telemetry & s-bus 16-ch receiver for $34 from Bangood :

https://www.banggood.com/FrSky-X8R-2...r_warehouse=CN

https://www.amazon.com/FrSky-Taranis...HFM/ref=sr_1_8

and a set of Sanyo eneloop 2000mAh batteries from Amazon (I already have the charger):

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

which seem to last forever (many hours) in this radio.

Bangood and many other places carry a full line of FrSky telemetry sensors:

https://www.banggood.com/search/frsky-sensor.html

Aloft Hobbies is another good local source that I used in the past :

https://alofthobbies.com/radio.html

https://www.gearbest.com/multi-rotor...00.html?wid=44

https://www.banggood.com/FrSky-ACCST...l?rmmds=search

.