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Low poly models without the low poly style
(programming.dev)
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Is it possible for you to modify models? It might be worthwhile to try looking into assets that can be billboarded or are baked down from higher fidelity models.
I don't know which engine you're using but many of them have solutions for generating their own LODs (with varying levels of effectiveness) too.
But if finding them fully finished like this is absolutely necessary then I'm afraid I don't have any helpful information.
I've found using the "decimate" function in blender good at lowering faces, but it only takes me so far (got maybe 250 faces to 100, but no lower). But I'll probably go for the oblivion style billboarding since I'm just prototyping anyway.