Do you have the room to have a big saw permanently set up?
Something like this
for $899 would do a great job.
There are many available in this class, I just did a quick search for contractor saws.
Key is having enough wight and heft so you're not tipping the saw when you leverage a sheet of plywood onto it. Most saws you see at HD and Lowes are purposely made light weight to make them easy so schlep out to job sites.
Second key is a fence system that's stable and will let you rip up to 48". That takes a big stationary machine.
You can build a simple outfeed table to catch the wood after the cut. The wood has to be supported so it does not raise up off the table at the end of the cut.