I've been considering buying one those cheap electronic loads that you can find on Amazon/eBay/AliExpress. One model that seems to be fairly ubiquitous right now is the DTL150. It appears to be fairly new, as I can't find much in the way of reviews or teardowns, etc. Best I could find was one video review on YouTube which wasn't particularly in-depth. Seems to be the new DL24, as there are loads of vendors on AliExpress.
Comes in two variants: an 'upgraded' version with a larger screen (2.4"), an external temperature sensor, and a cosmetic faceplate; a 'basic' one with a smaller screen (1.7"), no temp sensor input, no faceplate. I don't know whether the software on the basic one is the same, because the the upgrade version looks fancier. Both have 4-wire measurement.
Some of the criticism I've heard of these kind of units is that the specs are overblown, but that doesn't concern me too much as I don't have any requirement for anything more than half the claimed rating of 150W. (I mean, you just have to look at the PC heatsink and fan these things use - those aren't suitable for a 150W TDP CPU, so why would it provide enough cooling for 150W in this application?) If I assume the specs are bogus and de-rate by half, the only other thing that looks dodgy to me is the supplied 12V adapter, but seeing as (at least on AliExpress) they only come with US/EU plugs, I couldn't use it anyway. I suspect the 12V supply is only used directly to power the fan, and is otherwise regulated down, so any other PSU of approx. 12V will no doubt do the job.