Don’t know which HY1803D they were recommending. I found prices ranging from $55-200 on Amazon, depending on Brand. The “1803” means 18 volts by 3 amps.
Here’s a more versatile one I found on Ali Express (direct ship from China).
High reviews (4.9, only 5 and 4 star) on over 1,200 reviews.
Currently (no pun intended) on sale 50% off. About $50 after paying non-trivial shipping from China. Delivery may take up to a month.
I’d recommend upgrading the leads if you plan to use it at a higher wattage (VxA) range. Comments on this model mentioned non-trivial internal resistance (0.9 ohm) in the leads.
This TekPower version on Amazon is comparable in price to the Ali Express one, albeit less capable. $55 and Prime shipping. Popular and good reviews (4.4 overall 70% 5 star). Less risk with Amazon and free returns.
In contrast, the Mastek HY1803D will run about $200 on Amazon. Not great reviews (esp. WRT longevity). Reviews imply possible Quality Control issues (either got a 5 or a 1). Contrast with TekPower reviews (steady drop-off from 5 down to 1).