The statutory fee for a short-stay visa from Germany is €60 EUR. What currency it is payable in may vary by consular section and country, but is generally always payable in the local currency at the current exchange rate.
In the US, this is converted to US dollars at the current rate of exchange and then rounded up to the next whole dollar.
Due to the fluctuating exchange rate, the dollar amount in the section "Overview of visa fees" is rounded up.
At the current exchange rate, €60 is $67.90 (mid-market), so would be rounded up to $68.
To account for any further fluctuation in the exchange rate between now and the time your application is received, you might want to throw in another dollar.
The San Francisco consulate says that FedEx return of your passport is exactly $19 USD. Since this is a purely domestic service, it doesn't need to be converted to or from euros.
To return your passport with the visa, we exclusively use FedEx. We charge an extra fee of 19,- US dollars for this service.
This gives us a total of $88. If you're mailing it in, you should use a money order; cash may not be safe to mail. Just to be sure, you should also enclose a brief explanation of the amount you have enclosed and the purpose.