I have a lot of steel targets and for portability I like these:
$38 and great for 9mm.
https://shootsteel.com/economy-static-popper/
About the size of an A zone.
Only a single stake so they rotate a little and they’re 3/16” so unlikely to be happy being hit with anything more potent.
I found this:
$59 and the same concept but thicker. Free shipping.
Seems like a nice one man business. Good prices and the product looks solid. I’m going to use it for 300 blk and 9 major practice.