$30.99 – Quad’s Size: 40*28*7.5cm (the arms not folded, Charging Time: 120-150mins, Color: AS Shown, FOV: 120° Wide Angle, Transmitter Battery: 4x 1.5 AAA Battery (NOT Included), Quadcopter Battery: 7.4V 1200mAh Lipo (Included), with props guard), Flying Time: 15-17mins, Item NO.: E520, 4K–Picture/Video: 2560*1440 (Saved on SD Card), Video: 1280*720 (Saved on Mobile Phone), G-yro: 6 axis, Channel: 4CH, WiFi Distance: 50-70m, Video: 1920*1080 (Saved on SD Card), R/C Distance: 80-100m, 1080P–Picture: 1920*1088, Flying Weight: 280g (with Battery), Camera Optional: 720P / 2.4G WiFi 1080P / 2.4G WiFi 4K HD, 1080P–Picture: 1920*1088, 4K–Picture/Video: 3840*2160 (support IOS 6 or above and Android high-end system), 15*11*7.5cm (the arms folded), Motor: 8*23mm Brushed Coreless, Pixel: 720P–Picture/Video: 1280*720, Frequency: 2.4G.
You can get Eachine E520 WIFI Drone RTF for $30.99 using coupon code (in Banggood). Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($30.99)
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood. Is it a low price? Pretty good price – average ($32.39) is higher than current one!
Link: Banggood product page
Price: $30.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGE520, AFfbG10, affbg10, BGEachine, BGE520RU, 13f142, BGfd112b, BGquads, 8wEbgaInS5, BGVeiko15
(probably won’t work, but you can try them out)
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.
Price history and price alert
Here is price history (for all/most countries) for Eachine E520 WIFI Drone RTF. The lowest price was: $24.99.
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)).