I've been eyeing portable wood / twig stoves for the last month or so and think this one is a pretty good buy for ~$30 delivered. It's around half the price from the cheapest aliexpress sellers from what I've seen. I wanted a collapsible rocket stove but those are way out of my price range and this one is my 2nd choice.
This one is the larger 20x20cm version that can actually fit a steak or some larger snags on it, unlike the 14x14cm version.
There are cheaper ones and better ones, but not both from what I've seen (please someone link to other ones if you have good experience with them). This one appears to be made from steel that won't rust, has minimal warping from heat (will still be fully usable, just not as clean to fold open/closed or open/close the door) and can have additional twigs placed inside while there is a pot on top (not possible with some designs).
Ones to stay away from are those which are painted as they all tend to bubble or crack, potentially exposing metal underneath that can rust. There's not many online that are, but some of the cheap nasty hibachi style stoves are still painted.
Disclaimer to use common sense when using a portable wood stove such as not using when there's a fireban, making sure that it is placed on flat solid ground or a surface that can tolerate very high heat, do not ever use indoors and read up on their use and maintenance before using.