Well, for a movie with a budget of 90 million USD it isn't entirely unthinkable they spent $1000 or even $5000 at having someone cobble together a custom video game console, instead of badly disguising some existing system. Even if it isn't featured a lot in the movie, it has a very central role so to speak. If it had been something briefly used for 30 seconds and then the movie would go on with something else, I can agree they wouldn't spend a few thousand dollars on making a custom item but that is not really the case.
Besides if they got $2100 on selling the carcass of what was left of the prop, they probably got back the money spent on manufacturing it. According to IMDb, the cumulative worldwide gross is up to 961 million USD by now, so they would have made ten times the budget.
Edit: Hmm.. there were a lot of prop auctions. A standard PlayStation 1 for $120, just because it was part of a movie for a minute or two? A standard NES with 25 games and a zapper for $250? An Intellivision with 17 boxed games for $350?
There was a second smashed Jumanji console sold for $1500: https://propstoreauc.../124/lot/24128/though this one was smashed in a different way. Either they weren't pleased with the impact the first time, or wanted angles where it would not be consistent. The fact they had two smashed consoles for sale makes me wonder if they kept a third and a fourth prop unsmashed somewhere, just in case.
Most of the costumes existed in multiple copies, both for the leading actors and doubles (stunt, dance etc).