5-days-in-30 (flexi) = €365/2 adults... 7-days flexi costs €60 more.
Discount available through December 16, also for fewer or more travel days, also for continuous passes
This could be just the right fix for couples/friends hitting Christmas-markets around the country. Valid also to certain destinations outside Germany (Salzburg, Brussels, Venice under certain conditions.)
https://bahn.eurail.com/en/one-country-pass/german-rail-twin-pass