I have just checked coupons. The lowest price I could get is 67.99 USD for M5Stack PM2.5 Sensor (in Banggood). This is EU warehouse. Check coupons or create price alert down below. You probably want to know what is the best price?
Latest price update (UTC time):
Banggood (67.99 USD)
Banggood warehouse is located in Europe 
. There is no active coupon in my database right now (for Banggood). But wait a sec… Is it a good price? There’s only 1 record in my database, so I have no idea if the price is OK.
Link: Banggood product page
Price: 67.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGM5pm25, elec, AFfbG10, BGmodule12, BGVDay10%off, BGAFF10OFF, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGRUMB15, BGCuponation10, 13f142, BGHONEY2110, BGd0b05d, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG00c906, DealBGimpact, Cuponation9, 9OFFSUMMER, COUPONSDE1wk, BG8ReviTrage, BGcoupon8off, BGGutscheine, ADMITADBLACK, BG8OFFCOUPON, TTBLACK5, BG589b2e, BGSaleFeb8, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BG8FORMULAMX
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for M5Stack PM2.5 Sensor [EU] on Aliexpress
Here are coupons that you can use.
Price history and price alert
Not enough data to show price history chart… 29.99 USD is the only recorded price. It was not cheaper than that since we have saved it in DB.
You can set price alert (for Banggood).