10.1 Inch WUXGA(1920*1200) IPS multi-touch anti-smudge Screen, Intel Celeron N4100 Quad Core 1.1GHz, up to 2.4GHz 4MB Cache, Up to 128GB eMMC Storage Capacity, 4GB DDR4 RAM for Advanced Multitasking, Integrated Intel UHD Graphics 600 GPU.
Just check coupons out (with price alert and history). Let’s see what best price is ATM.
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 and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($464.41): TECH8%
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): 1B2G55128, 1B2G18128, 1B2G24128
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for Lenovo IdeaPad D330 4/128GB Tablet is here. The lowest price was: $389.99.
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)).