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The Sodium-Ion Battery Revolution Has Started
(cleantechnica.com)
This is a most excellent place for technology news and articles.
That's not a particularly big battery, that's why your battery is so cheap.
Even so, there's nearly always someone willing to buy an ICE car off you to fix it, unless it's a Stellantis product or something. Gets trickier with EVs because, again, cost.
Second hand battery packs are an option, but when I looked at ones for the car I was looking at, they still cost roughly the value of the car, unfortunately. On a car that entered production like 7 or 8 years ago.