Go down and check coupons out. Remember to check price history if it is available. Best price?
Operating Frequency: 7.5KHZ+/-1KHZ, Operate Current: STANDBY 65mA, Color: Yellow, Detect Objects: Metal, Operating Voltage Range: 7.2-9.6v, Material: ABS Plastic + Aluminum + Copper, Min Detection Diameter: 8″ (Test Coin: US ยข 50), Power Supply: 6x 1.5V AA Alkaline Batteries (Not Included), MAX 150mA
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):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
1. ($78.19): JanBGCoupon8
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG0224MD, AFfbG10, BGAFF10OFF, BGTT10, bGhOnEy10, BGherra, 7d18f7, BGGines, Tabby20
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for MD3010II Underground Metal Detector? There we go.
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)).