Aliexpress
Click here… to search for iWord S2088-88 Roll Up Piano on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (128.41 USD): BGMUSIC10
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): iWord15, 502C6B, aff7off, rcmus19, TTxBG10, 2019SPEDM, BGss11, AFfbG10, BGRTI23, BGRED621, BGPIANO20, BGBFAFF2019, BGCITYADS2019, BGIWK15, BGRU15, BGVDay10%off, BGMPB2020, bGhOnEy10, BGPIANO2, BGdragonBoat, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for iWord S2088-88 Roll Up Piano? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).