Working voltage: DC5-DC9V, Channels: up to 16 channel output, 2s Lipo recommended, Weight: 342g (without battery), Size: 158x 150x 58mm, 128* 64 resolution, Upgrade method: USB online upgrade, Display: 1.7-inch LCD display, Radio MCU: STM32F205VET6 (512kb), (factory with 4 * AA battery box, JR/FrSKY compatible module bay on rear side, Simulator mode: 3.5mm standard ppm output or USB HID, Firmware: JumperTX (an open source Firmware set based on the OpenTX Project), Voice support: YES, Gimbal Type: HALL Sensor, batteries not included).
Check coupons or create price alert down below. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($99.98): TTxBG10
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 502C6B
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Jumper T12 Plus RC Transmitter JP4-in-1? There we go. The lowest price was: $93.49.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).