You can possibly find a used display on ebay but you need to make sure it's compatable with your control module. I saw one that was listed new for $200 but that was over a year ago. I had the same issue with mine, and I talked to an engineer at perfect pass maybe a year ago or so. The issue as I understood is that for a few years they used a certain circuit board (I think Intel) and it's susceptible to moisture. Have you noticed that once you drive around for a while it comes back? That's what mine did. When moisture collected on the board, especially overnight while very humid, it causes the screen to dim. They realized the issue and changed circuit boards (09 maybe?) and the issue went away. Unfortunately, they had to design a new module for the new board so the previous module is no longer usable with your screen. You're not just paying for the screen, you're paying for the module also (black box). You can replace just the screen, but eventually, if not quickly, the same issue will happen.
Here's a couple possible solutions, or at least deterrents:
-Spray silicone on the circuit board from the back side of the screen unit. This was what perfect pass recommended to me. If you do this often, when it's definitely dry, it should help prevent moisture buildup. Don't do it when "wet" as you may just trap in moisture.
-Put silica gel packs (that come in new shoes, jacket pockets, etc) in the back side of the screen unit. Try to squish them through the holes.
The good news is that to my understanding you can upgrade to the stargazer system pretty reasonably if you want (maybe $800?), and you can install it yourself. I'm assuming your system is mechanical since it's having this issue. You should talk to them about that. The other good news is it's very simple to pull out the old system and install the stargazer yourself. Do not pay for labor, as they will give you instructions and a somewhat mechanically inclined person should be able to handle it. I speak from experience as I have done all of this on an 06 LSV due to the same issue.
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Boats previously owned - 2000 Supra Launch, 2003 Outback, 2006 Mobius LSV