Hi philipma1957,
50 Cards with 80x40x0,4mm or 100x60x0,4mm (single side) depending on availabilty ~ 150$
50 Cards to make manual a hole in one corner per card, depending on time ~ 60$
50 Cards marking a individual text (single side) ~ 50$
Shipping depending on your destination ~25-50$
If you can drill the holes per card by your own, that reduce the cost a little bit.
this is a rough estimate.
It sounds you will save your seed words on that cards.
another idea would be, I laser all the cards with the same matrix / table.
a line with letters and the possibility with a hammer and center punch to mark the letters in four lines under the letters.
anyone can do this by themselves, i can also send hammer and center punch.
Then you do not need to tell me your secret seed words
That Matrix / Table as a short excample and than you can mark your letters on the cards by your own with a hammer and punch
Best regards,
Willi