Just check coupons out (with price alert and history). What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
2ml easy switch to 4.5ml capacity with the extra 4.5ml glass tube, Thread: 510
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $29.99).
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)).