Closest I can find is probably the Anker Qi magnetic brick: https://www.amazon.com/Anker-Magnetic-Wireless-Portable-Powe...
5000mAh, only 5W Qi charging, and $45.
Again, not defending the Apple tax here, but it's not as far fetched as it sounds.
But yeah, OK, you can attach it with magnets to the back, that's worth double the cost. Oh wait, make that triple, since you need the case.
I better stop now, shitting on Apple was a favorite pasttime of mine.
I mean, as someone looking to manufacture and sell a premium product, I'm pretty happy with it, people will pay anything for imaginary benefits.
Also, the Anker device does have magnets. Looks like they operate just like the magsafe.
So wired charging is boring and magnetically attached is exciting?
You know, this is not like AirPods, which are completely disconnected from the phone. It's a lump attached on your phone that you may also unintentionally disconnect and drop on the floor while taking videos of something.
I'm way more "excited" by the cable, especially given the price (you can find pretty good 5000 mAh bricks for as little as $12).