Splitter puzzle: 720p Quadsplit for quad TV's in the back of a Mutant Vehicle.

Hey y'all. Got a kind of weird query today and am looking for ideas!

The problem

I have four 38" TV's that are identical and in square quad configuration. I'm looking for a way to cheaply split a signal from an Xbox 360 or Xbox One (Playing Halo: CE Classic) into the 4 TV's, efficiently having each TV dedicated to a players view.

Now I can do this in an expensive way as I have 3 ATEMs at my house and a whole wall of random video gear but the catch is that this quadsplit is going to live as a dedicated installation inside of my Mutant Vehicle (AKA Art Car).

Not trying to promote but here is some visual context of the vehicle: www.rynobus.com (scroll down for interior shots, the back wall is the one with the screens. 22 other screens are being added as well but that is under control)

Cheap Solutions?

So I'm not finding a whole lot online (in the sub $500 range, there are many fun Video Devices / BMD gear that would work, just not cost effective) to where I can get a quad out of a single 720 signal from an Xbox. Anyone know of any hardware I may have overlooked? Right now the new Blackmagic Multiview 4 HD ($185) seems ok but requires 4 HDMI/SDI shakers to get everything into SDI on the box, making it tricky.

Thanks!

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Submitted by worksafe_dp | #Specialdealer Special Offer Online Shopping Store 2016