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There are tons on eBay and Amazon. Under $50 a set from what I saw. Pair for $37: For 1973-1991 Chevy Blazer Pair Rear Tail Lights Driver and Passenger Side w/Chrome Trim GM2800122 GM2801122 - replaces 5968329 5968330 https://a.co/d/0vfUZz7
I did a decent search, didn't see the style of yours. A few kind of close, but not exact.
I've heard, and have no doubt, that the aftermarket lenses are nowhere near as good as OEM, but for the price, not sure I'd care if I got 10 years out of them.