I have just checked coupons. The lowest price I could get is $255.99 for Hantek DSO5072P Digital Storage Oscilloscope (in Banggood). You can create price alert here, copy coupons and view price history. What is the best price?
Record Length 40K, Inputs Impendance 1MΩ±2% //20pF±3pF, Waveform Interpolation (sinx)/x, Sample Rate Range 500MS/s–1GS/s, SEC/DIV Range 4ns/div to 40s/div, Rise Time at BNC(typical) 5ns, Sample Rate Real-Time Sample: 1GS/s, Bandwidth 70MHz
Latest coupon code price check (UTC time):
Banggood ($255.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. I think you want to know if the price is good. Hmmm, price is higher than average (which is $189.99 right now), so better set price alert down below…
Link: Banggood product page
Price: $255.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 4000c3, bGhOnEy10, 7d18f7, BGSS10%SW, bgshOOp10, BGELIG0920, BG11SHOP, 13f142, BGCuponation10, BG947fc0, BGAUGUST8, BGTOOS729, BGCAPITALOS8, BGCOUPERT8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Hantek DSO5072P Digital Storage Oscilloscope.
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)).