Some payment processors have "micropayment" fee structures, where they take a hi...

Some payment processors have "micropayment" fee structures, where they take a higher % (5% in PayPal's case) for a lower fixed fee per transaction.

PayPal's traditional fee (for USD)[1] = 3.49% + $.3, for $1 = $0.3349

PayPal's micropayment fee (for USD)[2] = 4.99% + $.09, for $1 = $0.1349

Using that model would make sense in OP's case.