Quantity 5 pcs, Material PE, Light color Colorful / green / blue.
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 price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($11.93): BG00c906
coupon code has to be applied in shop’s 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): 8wEbgaInS5, BG7d9070, BG8a8bef, TTSUMMER8, Cuponation9
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for ZANLURE 5Pcs Underwater LED Lamp Fluorescent Glow? There we go. The lowest price was: $5.99.
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)).