Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Xiaomi Multifunctional Sports Leisure Chest Waist Bag | 17.46 USD | – |
 |
Xiaomi Multifunction U-shaped Massage Neck Pillow | 36.78 USD | – |
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (44.17 USD): BGAlerabat1
Coupon (48.84 USD): BG00c906
(CouponsFromChina.com tip: you should apply the coupon in your 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): BT806, CS911, Home26, XMP1120, 8c7a15, 502C6B, vipupgrade8, BGRU241, TTxBG10, aff7off, bgssaff9, AFfbG10, BGPL222, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGHOMEG12, BGWWBUI, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEA15%, BgcLuBofErtA10, BGCuponation10, 13f142, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, 00c906
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Multifunction U-shaped Massage Neck Pillow.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).