You can create price alert here, copy coupons and view price history. What is best price?
GIF, MPEG-1/2/4, APE, Display technology: TI DLP, AV, WMV7/8, Screen size (diagonal): 20″- 200″, Internal speaker: 2.2W, External Memory: USB, BMP, Supported audio formats: MP3, USB, FLAC, Supported video formats: H.264, Throw ratio: 1.2: 1, OGG, WMA, Keystone: Auto/Manual ±40 Vertical, Focus: Manual, Support3D: 3D SBS, Micro SD(up to 32G), Weight: 500g, H.263, VP6, ATRA, Light source: RGB LED, Blu-ray (support transfer 3D to 2D) Output: 3.5 mm audio out jack for headphone/SPDIF, Supported photo formats: JPEG, Lens Offset: 100%, Contrast ratio: 1000: 1, 3D TNB, DIVX-3/4/5/ 6, XVID, Brightness: 450ANSI (4500 lumens), AVS, VP8, VGA, Native resolution: 1280x 800, Size: 158(L)*120(W)*31(H)mm, Input port: HDMI, VC-1
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($513.03): BGLaurent
2. ($524.69): BGAProjector
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGWoH101, aff7off, BGaDmITAd, bgchinafest, BGCITYADS2019, bGpAnDacHeCk, Email5, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGAFF7OFF, bgshOOp10, BgoFErTaSchInA10, 7bcdf9, BGProjectors, BGPROBuscape
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Wowoto H10 DLP Projector.
Price records source(s): Gearbest, 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)).