Well, most of the screens work well for us, even after those 21 years, both on Tamagotchis and Digimon. It's very rare to have a irrepairable screen condition like yours.
I think the original retail price of those 20th anniversary ones was 35$ or so, but they were only sold on the Premium Bandai store for a very limited run, hence why they're so expensive- Digimon things aren't sold to the public, only adult collectors online. (Since it's not a kid's franchise anymore, but an adult one.) So there's no real sulprus of them, especially since the 20th anniversary Pendulums just came out. Ebay generally overprices them, they sometimes go for like 65$ on JapanYouWant if you're lucky (the second wave mostly, the first wave in the original colors goes for more).