$349.99 – – Dual channel output, – 30MHz frequency output, – 500MSa/s Sample rate，Vertical resolution 1μHz.
ATM you can buy OWON XDG2030 Arbitrary Waveform Generator Signal Generator for $349.99 (in Banggood). Price history, coupons and price alert are available on this page. What is best price?
Latest coupon and price update (UTC):
Banggood ($349.99)
Banggood warehouse is located in China. I have no active coupons for you right now. You probably want to know if this is a good price. According to my database, the average price is $364.57 and current price is $349.99, so it’s probably a good price!
Link: Banggood product page
Price: $349.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): Cuponation9, BGGines, BGTools8, BGNEWYEAR8
(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
Here is price history (for all/most countries) for OWON XDG2030 Arbitrary Waveform Generator Signal Generator. The lowest price was: $339.99.
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)).