I agree that this topic should be a "sticky".
Solar film is an inexpensive alternative as has been mentioned.
It only costs $40-$45 for an A4 size sheet.
I went halves with Rob Xreckor in a sheet, and with that $20 half sheet have turned 3 scopes + their finders, and one monocular into solar viewers. $5 per instrument. How cheap is that.
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