NanoKVM from Sipeed? The lite version (without display or ATX power support though) is around that price (even below on their website). Supposedly it's fully open sourced now.
They also have a PCIe version that's supposedly going to be shipped soon (and a few other versions that they teased)
I'll note that the enclosure design (especially on lite version which doesn't really have one), performance (and the UI from what I've seen) are worse than JetKVM, so the price they reached is actually very impressive, since the non-lite NanoKVM isn't that much cheaper ($53 excl. Shipping)
I think they'd be hard-pressed to get the price point down too much below where it is on this thing, seems it's already at a sweet spot, given your average RPi doesn't have that capture capability or a screen at all
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They also have a PCIe version that's supposedly going to be shipped soon (and a few other versions that they teased)