These were brought to my attention by a guy I met at Birchwood Range when I was shooting a couple of weeks ago (I have no relation to the company other than customer).
RSR Steel sells a target that ships in a flat rate box, they have a few different targets that ship flat rate, I purchased the reduced IPSC. The only item required to complete the the target is a 2x4 to connect the base to the target. This target retails for $165
The package was a little beat up when it arrived, but the contents were present and unharmed
What was in the box
The assembled base, note the slots on the side that allow you to use it as a stand for paper targets
The back of the target
The full target
So far I've shot it with my .22lr rifle and .45ACP pistol, I haven't shot it with a rifle yet, but I intend to.