I'm looking for a set of or ANY ND filters in 77mm

I'm needing them more and more but I plan to buy super expensive ones in the future, but for now looking for something cheap / free to get me by.

I have a few extra yellow filters in smaller sizes, but I suspect if you have ND filters, you'll have yellow filters... I have an extra 77mm red filter I think.

Anyway worth a shot right?

When I'm done with them I can pay it forward (or backward).

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