Try asking online vendors if they'll do this for you.

If nobody will do this, you can try this trick if your prescription is
the same (or close to it) in each eye. Get a pair of glasses with
enough symmetry in the lenses that you can install them upside down.
Most ovals or circles will work. In some cases, you'll need to swap
left and right; it depends on whether there's much difference in
thickness between the left and right edges of the lenses. I have one
pair with very small oval lenses where the thickness is almost equal
on both sides, so I can turn them upside down without swapping them,
and not be able to tell the difference. The lenses in most of my
glasses are thicker on the outer edges, including a pair with circles,
so I'd have to swap them if I wanted to turn them upside down.

This trick might not work for some people, since it could move the
optical centers of the lenses too far from the pupils. But many pairs
are inexpensive enough to be worth experimenting with.
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