Depends on from which outlet you rent. Sixt seems indeed to be more expensive than the previous years (I usually rent every other weekend for 70 EUR but now it is usually above 100 EUR, but now with unlimited kilometres, while last year is was 300 km per day, i.e. 900 km for the weekend). Hertz is more or less the same than last year with a slight increase for rentals during the week.

All rental agencies charge now (sometimes quite heavy) surcharges for oneway rentals or if you need to cross the border into another country.