$21.99 – 10Pcs T12 Lead-free Alloy Soldering Iron Tips Set (Banggood, Aliexpress: 10PCS T12 Lead-free Alloy Stainless Steel Color Soldering Iron Tips Set (the best price with coupon)).
ATM you can buy 10Pcs T12 Lead-free Alloy Soldering Iron Tips Set for $21.99 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Latest coupon and price update (UTC):
Banggood ($21.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Well, is it a good price anyway? Well, this price is higher than average price ($17.45)
Link: Banggood product page
Price: $21.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG589b2e
(these coupons are old, so probably won’t work)
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.
Price history and price alert
Check out price history chart (for all/most countries) for 10Pcs T12 Lead-free Alloy Soldering Iron Tips Set. The lowest price was: $15.99.
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)).