Size: 2.5 inch, Material: ABS.
Just check coupons out (with price alert and history). Best price?
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($16.73): Cuponation9
2. ($17.29): BG00c906
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): aff7off, 502C6B, e2bcea, TTxBG10, 2019SPEDM, BG3CSUM, bgssaff9, BG7f8344, AFfbG10, BGNFvy567, BGCITYADS2019, BGVDay10%off, 13f142, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGNDS10OFF, BGCuponation10, BGHONEY2110, BANGGOODSD, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204, BG763687, BGJUNEGSG9
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Maiwo K104 Hard Drive Enclosure White ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Maiwo K104 Hard Drive Enclosure Black. The lowest price was: $2.99.
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)).